Catch error where process killing didn't scceed

src/index.ts

@@ -49,7 +49,15 @@ export class DeferedSpawn extends Emittery {
 
   kill() {
     console.log("killing process!", this.process.spawnargs.join(" "));
-    process.kill(-this.process.pid); // https://stackoverflow.com/a/49842576
+    try {
+      process.kill(-this.process.pid); // https://stackoverflow.com/a/49842576
+    } catch (e) {
+      console.log(
+        "Didn't kill process",
+        this.process.spawnfile,
+        ", maybe it was killed already"
+      );
+    }
   }
 
   write(data: string) {