diff --git a/common/changes/@microsoft/rush/copilot-patch-set-logfilepaths-conditionally_2026-03-20-22-27.json b/common/changes/@microsoft/rush/copilot-patch-set-logfilepaths-conditionally_2026-03-20-22-27.json
new file mode 100644
index 00000000000..e5b20c0b1d4
--- /dev/null
+++ b/common/changes/@microsoft/rush/copilot-patch-set-logfilepaths-conditionally_2026-03-20-22-27.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "Update OperationExecutionRecord to only set `this.logFilePaths` if the value to be assigned is not `undefined`",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@microsoft/rush"
+}
diff --git a/libraries/rush-lib/src/logic/operations/OperationExecutionRecord.ts b/libraries/rush-lib/src/logic/operations/OperationExecutionRecord.ts
index 63da9421b54..8ff0034b716 100644
--- a/libraries/rush-lib/src/logic/operations/OperationExecutionRecord.ts
+++ b/libraries/rush-lib/src/logic/operations/OperationExecutionRecord.ts
@@ -307,7 +307,9 @@ export class OperationExecutionRecord implements IOperationRunnerContext, IOpera
           logFilenameIdentifier: `${this._operationMetadataManager.logFilenameIdentifier}${logFileSuffix}`
         })
       : undefined;
-    this.logFilePaths = logFilePaths;
+    if (logFilePaths !== undefined) {
+      this.logFilePaths = logFilePaths;
+    }
 
     const projectLogWritable: TerminalWritable | undefined = logFilePaths
       ? await initializeProjectLogFilesAsync({