Index: typo3/sysext/scheduler/mod1/locallang.xml
===================================================================
--- typo3/sysext/scheduler/mod1/locallang.xml	(revision 7878)
+++ typo3/sysext/scheduler/mod1/locallang.xml	(working copy)
@@ -68,6 +68,7 @@
 			<label index="msg.noTasks">No tasks defined yet.</label>
 			<label index="msg.notExecuted">Not executed: %s</label>
 			<label index="msg.executionFailed">Execution of task "%1$s" failed with the following message: %2$s</label>
+			<label index="msg.executionFailureDefault">The execution failed, but the error message could not be retrieved (it was probably too large). Sorry.</label>
 			<label index="msg.executionFailureReport">Execution failed: %1$d, %2$s</label>
 			<label index="msg.noStartDate">Please define a start date.</label>
 			<label index="msg.invalidStartDate">Start date is invalid.</label>
Index: typo3/sysext/scheduler/mod1/index.php
===================================================================
--- typo3/sysext/scheduler/mod1/index.php	(revision 7878)
+++ typo3/sysext/scheduler/mod1/index.php	(working copy)
@@ -1094,10 +1094,16 @@
 
 						// A failure is the worst thing that could happen, so it must overwrite all other statuses
 					if (!empty($schedulerRecord['lastexecution_failure'])) {
+						$executionStatus       = 'failure';
+							// Try to get the stored exception object
 						$exception = unserialize($schedulerRecord['lastexecution_failure']);
-
-						$executionStatus       = 'failure';
-						$executionStatusDetail = sprintf($GLOBALS['LANG']->getLL('msg.executionFailureReport'), $exception->getCode(), $exception->getMessage());
+							// If the exception could not be unserialized, issue a default error message
+						$executionStatusDetail = '';
+						if ($exception === FALSE) {
+							$executionStatusDetail = $GLOBALS['LANG']->getLL('msg.executionFailureDefault');
+						} else {
+							$executionStatusDetail = sprintf($GLOBALS['LANG']->getLL('msg.executionFailureReport'), $exception->getCode(), $exception->getMessage());
+						}
 					}
 
 						// Format the execution status