diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java
index 78c3d0a71625e63cb66e8885fac541aeff29ac00..9dd92f7d7683be9a83c648b1145c1297166bfab5 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java
@@ -533,7 +533,7 @@ public class WebRTCWrapper {
     }
 
     public boolean applyDtmfTone(String tone) {
-        if (toneManager == null || peerConnection.getSenders().isEmpty()) {
+        if (toneManager == null || peerConnection == null || peerConnection.getSenders().isEmpty()) {
             return false;
         }
         peerConnection.getSenders().get(0).dtmf().insertDtmf(tone, TONE_DURATION, 100);