Index: libcfa/src/concurrency/cofor.hfa
===================================================================
--- libcfa/src/concurrency/cofor.hfa	(revision cce0807bda0b7225dfa1e297cee67d159ff260b9)
+++ libcfa/src/concurrency/cofor.hfa	(revision c36a4198e8f7c0fb7cafec586aebca035adef800)
@@ -37,4 +37,6 @@
         runner_node * node = &try_pop_front( items );
 		unlock( mutex_lock );
+		if ( !node )
+			continue;
         func( node->value );
         free( node->value );