diff --git a/.changeset/guard-task-detail-log-entry-shape.md b/.changeset/guard-task-detail-log-entry-shape.md
new file mode 100644
index 0000000000..31ef6ab0ea
--- /dev/null
+++ b/.changeset/guard-task-detail-log-entry-shape.md
@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Guard task detail activity-log rendering against legacy/operator log entries that use text/detail instead of action/outcome.
diff --git a/packages/dashboard/app/__tests__/task-log-entry-display.test.ts b/packages/dashboard/app/__tests__/task-log-entry-display.test.ts
new file mode 100644
index 0000000000..24af305c8a
--- /dev/null
+++ b/packages/dashboard/app/__tests__/task-log-entry-display.test.ts
@@ -0,0 +1,62 @@
+import { describe, expect, it } from "vitest";
+import type { InReviewStallCode, Task } from "@fusion/core";
+import { findInReviewStallLogEntry } from "../utils/findInReviewStallLogEntry";
+import { getInReviewStallDeadlockCopy } from "../utils/inReviewStallCopy";
+import { getTaskLogEntryAction, getTaskLogEntryOutcome } from "../utils/taskLogEntryDisplay";
+
+describe("task log entry display helpers", () => {
+  it("falls back to text/detail for legacy or operator-shaped log entries", () => {
+    const entry = {
+      timestamp: "2026-06-14T18:50:17Z",
+      text: "Operator parked incomplete stuck-loop-exhausted task",
+      detail: "Backups preserved before recovery",
+      type: "operator",
+    };
+
+    expect(getTaskLogEntryAction(entry)).toBe("Operator parked incomplete stuck-loop-exhausted task");
+    expect(getTaskLogEntryOutcome(entry)).toBe("Backups preserved before recovery");
+  });
+
+  it("returns safe empty display values for malformed entries", () => {
+    expect(getTaskLogEntryAction({ timestamp: "now" })).toBe("");
+    expect(getTaskLogEntryOutcome({ timestamp: "now" })).toBeUndefined();
+    expect(getTaskLogEntryAction(undefined)).toBe("");
+  });
+
+  it("falls back from blank action/outcome strings to legacy fields", () => {
+    const entry = {
+      timestamp: "2026-06-14T18:50:17Z",
+      action: "   ",
+      outcome: "",
+      text: "Legacy action text",
+      detail: "Legacy detail text",
+    };
+
+    expect(getTaskLogEntryAction(entry)).toBe("Legacy action text");
+    expect(getTaskLogEntryOutcome(entry)).toBe("Legacy detail text");
+  });
+
+  it("does not throw while scanning logs that contain entries without action", () => {
+    const task = {
+      log: [
+        { timestamp: "2026-06-14T18:50:17Z", text: "operator note", type: "operator" },
+        { timestamp: "2026-06-14T18:51:17Z", action: "In-review stall surfaced [merge-retries-exhausted]" },
+      ],
+    } as unknown as Pick<Task, "log">;
+
+    const code: InReviewStallCode = "merge-retries-exhausted";
+    expect(findInReviewStallLogEntry(task, code)?.reversedIndex).toBe(0);
+  });
+
+  it("does not throw while checking deadlock copy logs that contain entries without action", () => {
+    const task = {
+      pausedReason: undefined,
+      log: [
+        { timestamp: "2026-06-14T18:50:17Z", text: "operator note", type: "operator" },
+        { timestamp: "2026-06-14T18:51:17Z", action: "In-review stall auto-disposed [merge-blocker]" },
+      ],
+    } as unknown as Pick<Task, "pausedReason" | "log">;
+
+    expect(getInReviewStallDeadlockCopy(task)?.headline).toBe("In-review deadlock auto-disposed");
+  });
+});
diff --git a/packages/dashboard/app/components/TaskDetailModal.tsx b/packages/dashboard/app/components/TaskDetailModal.tsx
index 2d2865e2ae..7f33c9702c 100644
--- a/packages/dashboard/app/components/TaskDetailModal.tsx
+++ b/packages/dashboard/app/components/TaskDetailModal.tsx
@@ -60,6 +60,7 @@ import { getInReviewStallCopy, shouldShowInReviewStallBadge } from "../utils/inR
 import { getStalePausedReviewCopy, shouldShowStalePausedReviewBadge } from "../utils/stalePausedReviewCopy";
 import { getTaskAgeStalenessCopy } from "../utils/taskAgeStalenessCopy";
 import { findInReviewStallLogEntry, IN_REVIEW_STALL_LOG_REGEX } from "../utils/findInReviewStallLogEntry";
+import { getTaskLogEntryAction, getTaskLogEntryOutcome } from "../utils/taskLogEntryDisplay";
 
 interface ModelSelection {
   provider?: string;
@@ -3236,10 +3237,13 @@ export function TaskDetailContent({
                   ) : workingTask.log && workingTask.log.length > 0 ? (
                     <div className="detail-activity-list" ref={activityListRef}>
                       {(() => {
+                        // FNXC:TaskDetail 2026-06-14-13:43 Activity rendering must tolerate legacy `text`/`detail` log entries.
                         let highlightedOnce = false;
                         return [...workingTask.log].reverse().map((entry, i) => {
-                          const stallMatch = entry.action.match(IN_REVIEW_STALL_LOG_REGEX)
-                            ?? entry.action.match(STALE_PAUSED_REVIEW_LOG_REGEX);
+                          const action = getTaskLogEntryAction(entry);
+                          const outcome = getTaskLogEntryOutcome(entry);
+                          const stallMatch = action.match(IN_REVIEW_STALL_LOG_REGEX)
+                            ?? action.match(STALE_PAUSED_REVIEW_LOG_REGEX);
                           const isHighlighted = !highlightedOnce
                             && highlightStallCode != null
                             && stallMatch?.[1] === highlightStallCode;
@@ -3256,10 +3260,10 @@ export function TaskDetailContent({
                                 <span className="detail-log-timestamp">
                                   {formatTimestamp(entry.timestamp)}
                                 </span>
-                                <span className="detail-log-action">{entry.action}</span>
+                                <span className="detail-log-action">{action}</span>
                               </div>
-                              {entry.outcome && (
-                                <div className="detail-log-outcome">{entry.outcome}</div>
+                              {outcome && (
+                                <div className="detail-log-outcome">{outcome}</div>
                               )}
                             </div>
                           );
@@ -3337,7 +3341,7 @@ export function TaskDetailContent({
                   {shouldShowStalePausedReviewBadge(workingTask) && workingTask.stalePausedReview && (() => {
                     const copy = getStalePausedReviewCopy(workingTask.stalePausedReview);
                     const logMatch = [...(workingTask.log ?? [])].reverse().find((entry) => {
-                      const match = entry.action.match(STALE_PAUSED_REVIEW_LOG_REGEX);
+                      const match = getTaskLogEntryAction(entry).match(STALE_PAUSED_REVIEW_LOG_REGEX);
                       return match?.[1] === workingTask.stalePausedReview?.code;
                     });
                     return (
diff --git a/packages/dashboard/app/utils/findInReviewStallLogEntry.ts b/packages/dashboard/app/utils/findInReviewStallLogEntry.ts
index 6563dc9869..546a006d39 100644
--- a/packages/dashboard/app/utils/findInReviewStallLogEntry.ts
+++ b/packages/dashboard/app/utils/findInReviewStallLogEntry.ts
@@ -1,4 +1,5 @@
 import type { InReviewStallCode, Task, TaskLogEntry } from "@fusion/core";
+import { getTaskLogEntryAction } from "./taskLogEntryDisplay";
 
 export const IN_REVIEW_STALL_LOG_PREFIX = "In-review stall surfaced [";
 export const IN_REVIEW_STALL_LOG_REGEX = /^In-review stall surfaced \[([^\]]+)\]/;
@@ -19,7 +20,7 @@ export function findInReviewStallLogEntry(
 
   const reversed = [...task.log].reverse();
   for (const [reversedIndex, entry] of reversed.entries()) {
-    const match = entry.action.match(IN_REVIEW_STALL_LOG_REGEX);
+    const match = getTaskLogEntryAction(entry).match(IN_REVIEW_STALL_LOG_REGEX);
     if (!match || match[1] !== code) {
       continue;
     }
diff --git a/packages/dashboard/app/utils/inReviewStallCopy.ts b/packages/dashboard/app/utils/inReviewStallCopy.ts
index cee550a734..e2ae577754 100644
--- a/packages/dashboard/app/utils/inReviewStallCopy.ts
+++ b/packages/dashboard/app/utils/inReviewStallCopy.ts
@@ -1,6 +1,7 @@
 import type { InReviewStallCode, InReviewStallSignal, Task } from "@fusion/core";
 
 import { MAX_AUTO_MERGE_RETRIES } from "../hooks/useBlockerFanout";
+import { getTaskLogEntryAction } from "./taskLogEntryDisplay";
 
 export interface InReviewStallCopy {
   badgeLabel: string;
@@ -109,12 +110,15 @@ const IN_REVIEW_STALL_DEADLOCK_COPY: InReviewStallDeadlockCopy = {
     "Inspect the merge blocker/branch conflict, recover manually, then unpause to retry. If recovery needs extra implementation, create a follow-up with fn_task_refine.",
 };
 
+/**
+ * FNXC:TaskLogs 2026-06-14-13:51 Detects in-review deadlock logs while tolerating legacy entries without `action`.
+ */
 export function getInReviewStallDeadlockCopy(task: Pick<Task, "pausedReason" | "log">): InReviewStallDeadlockCopy | undefined {
   if (task.pausedReason === "in-review-stall-deadlock") {
     return IN_REVIEW_STALL_DEADLOCK_COPY;
   }
 
-  const hasDeadlockLog = task.log?.some((entry) => entry.action.startsWith(IN_REVIEW_STALL_DEADLOCK_LOG_PREFIX)) ?? false;
+  const hasDeadlockLog = task.log?.some((entry) => getTaskLogEntryAction(entry).startsWith(IN_REVIEW_STALL_DEADLOCK_LOG_PREFIX)) ?? false;
   return hasDeadlockLog ? IN_REVIEW_STALL_DEADLOCK_COPY : undefined;
 }
 
diff --git a/packages/dashboard/app/utils/taskLogEntryDisplay.ts b/packages/dashboard/app/utils/taskLogEntryDisplay.ts
new file mode 100644
index 0000000000..078367594b
--- /dev/null
+++ b/packages/dashboard/app/utils/taskLogEntryDisplay.ts
@@ -0,0 +1,34 @@
+import type { TaskLogEntry } from "@fusion/core";
+
+export type TaskLogEntryLike = Omit<Partial<TaskLogEntry>, "action" | "outcome"> & {
+  action?: unknown;
+  outcome?: unknown;
+  text?: unknown;
+  detail?: unknown;
+};
+
+/**
+ * FNXC:TaskDetail 2026-06-14-13:43 Safely extract an activity-log action string with legacy `text` fallback.
+ */
+export function getTaskLogEntryAction(entry: TaskLogEntryLike | null | undefined): string {
+  if (typeof entry?.action === "string" && entry.action.trim().length > 0) {
+    return entry.action;
+  }
+  if (typeof entry?.text === "string" && entry.text.trim().length > 0) {
+    return entry.text;
+  }
+  return "";
+}
+
+/**
+ * FNXC:TaskDetail 2026-06-14-13:43 Safely extract an activity-log outcome string with legacy `detail` fallback.
+ */
+export function getTaskLogEntryOutcome(entry: TaskLogEntryLike | null | undefined): string | undefined {
+  if (typeof entry?.outcome === "string" && entry.outcome.trim().length > 0) {
+    return entry.outcome;
+  }
+  if (typeof entry?.detail === "string" && entry.detail.trim().length > 0) {
+    return entry.detail;
+  }
+  return undefined;
+}