diff --git a/source/vibe/core/core.d b/source/vibe/core/core.d
index 1d66cca..486aa0b 100644
--- a/source/vibe/core/core.d
+++ b/source/vibe/core/core.d
@@ -1274,13 +1274,16 @@ package(vibe) void resumeCoreTask(CoreTask ctask, Exception event_exception = nu
 nothrow @safe {
 	assert(ctask.thread is () @trusted { return Thread.getThis(); } (), "Resuming task in foreign thread.");
 	assert(() @trusted nothrow { return ctask.state; } () == Fiber.State.HOLD, "Resuming fiber that is not on HOLD");
-	assert(ctask.m_queue is null, "Manually resuming task that is already scheduled to be resumed.");
 
-	if( event_exception ){
+	if (event_exception) {
 		extrap();
+		assert(!ctask.m_exception, "Resuming task with exception that is already scheduled to be resumed with exception.");
 		ctask.m_exception = event_exception;
 	}
 
+	// do nothing if the task is aready scheduled to be resumed
+	if (ctask.m_queue) return;
+
 	auto uncaught_exception = () @trusted nothrow { return ctask.call!(Fiber.Rethrow.no)(); } ();
 
 	if (uncaught_exception) {