Fix exit method bug

Author: swaylq

src/createFFmpeg.js

@@ -178,10 +178,15 @@ module.exports = (_options = {}) => {
       throw NO_LOAD;
     } else {
       running = false;
-      Core.exit(1);
-      Core = null;
-      ffmpeg = null;
-      runResolve = null;
+      try {
+        Core.exit(1);
+      } catch (e) {
+        log(e.message);
+      } finally {
+        Core = null;
+        ffmpeg = null;
+        runResolve = null;
+      }
     }
   };