Index: libcfa/src/concurrency/cofor.hfa
===================================================================
--- libcfa/src/concurrency/cofor.hfa	(revision 29eaa3fa749147eb45c7ff3d89e0e14968060652)
+++ libcfa/src/concurrency/cofor.hfa	(revision 0da94752579e6e8d62d9aa2e565147c5366d2791)
@@ -37,4 +37,6 @@
         runner_node * node = &try_pop_front( items );
 		unlock( mutex_lock );
+		if ( !node )
+			continue;
         func( node->value );
         free( node->value );