@@ -504,10 +504,13 @@
 	return self;
 }
 
 - flushWriteCache
 {
+	if (wcache == NULL)
+		return self;
+
 	[self _writeNBytes: wcache_len
 		fromBuffer: wcache];
 
 	[self freeMemory: wcache];
 	wcache = NULL;