Add guard

vadymmarkov · Sep 4, 2016 · 04fc145 · 04fc145
1 parent e83eeb7
commit 04fc145
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Source/SignalTracking/Units/InputSignalTracker.swift b/Source/SignalTracking/Units/InputSignalTracker.swift
@@ -68,6 +68,10 @@ public class InputSignalTracker: SignalTracker {
   }
 
   public func stop() {
+    guard audioEngine != nil else {
+      return
+    }
+
     audioEngine?.stop()
     audioEngine?.reset()
     audioEngine = nil