fix(map): Clear transitive overlay data when unmounting component

Author: David Emory

lib/components/map/transitive-overlay.js

@@ -51,7 +51,7 @@ class TransitiveCanvasOverlay extends MapLayer {
 
   componentWillReceiveProps (nextProps) {
     // Check if we received new transitive data
-    if (!isEqual(nextProps.transitiveData, this.props.transitiveData)) {
+    if (this._transitive && !isEqual(nextProps.transitiveData, this.props.transitiveData)) {
       this._transitive.updateData(nextProps.transitiveData)
       if (!nextProps.transitiveData) this._transitive.render()
       else this._updateBoundsAndRender()
@@ -71,7 +71,12 @@ class TransitiveCanvasOverlay extends MapLayer {
     }
   }
 
-  componentWillUnmount () { }
+  componentWillUnmount () {
+    if (this._transitive) {
+      this._transitive.updateData(null)
+      this._transitive.render()
+    }
+  }
 
   // Internal Methods