1 files changed, 6 insertions, 2 deletions
diff --git a/devtools/shared/protocol/Pool.js b/devtools/shared/protocol/Pool.js
index b5cb4c3eb1..0bbad46161 100644
--- a/devtools/shared/protocol/Pool.js
+++ b/devtools/shared/protocol/Pool.js
@@ -212,8 +212,12 @@ class Pool extends EventEmitter {
         actor.destroy = destroy;
       }
     }
-    this.conn.removeActorPool(this);
-    this.conn = null;
+
+    // `conn` might be null for LazyPool in an unexplained way.
+    if (this.conn) {
+      this.conn.removeActorPool(this);
+      this.conn = null;
+    }
   }
 }