[node] prevent race condition for renderFinished

1 files changed, 6 insertions, 0 deletions

diff --git a/platform/node/src/node_map.cpp b/platform/node/src/node_map.cpp
index 9b76f0f542..521cca1a51 100644
--- a/platform/node/src/node_map.cpp
+++ b/platform/node/src/node_map.cpp
@@ -447,6 +447,12 @@ void NodeMap::startRender(NodeMap::RenderOptions options) {
 }
 
 void NodeMap::renderFinished() {
+    if (!callback) {
+        // In some situations, the render finishes at the same time as we call cancel. Make sure
+        // we are only finishing a render once.
+        return;
+    }
+
     Nan::HandleScope scope;
 
     // We're done with this render call, so we're unrefing so that the loop could close.