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-rw-r--r--src/Canvas.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Canvas.cpp b/src/Canvas.cpp
index 9bba605..db02ffe 100644
--- a/src/Canvas.cpp
+++ b/src/Canvas.cpp
@@ -1196,7 +1196,7 @@ switch (event->type) {
void
GanvCanvasImpl::ports_joined(GanvPort* port1, GanvPort* port2)
{
- if (port1 == port2 || !port1 || !port2) {
+ if (port1 == port2 || !port1 || !port2 || !port1->impl || !port2->impl) {
return;
}