diff --git a/src/main/java/eu/siacs/conversations/services/CallIntegration.java b/src/main/java/eu/siacs/conversations/services/CallIntegration.java
index 93b25e25f..86a824ffb 100644
--- a/src/main/java/eu/siacs/conversations/services/CallIntegration.java
+++ b/src/main/java/eu/siacs/conversations/services/CallIntegration.java
@@ -297,7 +297,8 @@ public class CallIntegration extends Connection {
     }
 
     private AudioDevice getAudioDeviceFallback() {
-        return requireAppRtcAudioManager().getSelectedAudioDevice();
+        final var audioDevice = requireAppRtcAudioManager().getSelectedAudioDevice();
+        return audioDevice == null ? AudioDevice.NONE : audioDevice;
     }
 
     private void setAudioDeviceFallback(final AudioDevice audioDevice) {
diff --git a/src/main/java/eu/siacs/conversations/services/CallIntegrationConnectionService.java b/src/main/java/eu/siacs/conversations/services/CallIntegrationConnectionService.java
index ce4d9fb8a..a234fc781 100644
--- a/src/main/java/eu/siacs/conversations/services/CallIntegrationConnectionService.java
+++ b/src/main/java/eu/siacs/conversations/services/CallIntegrationConnectionService.java
@@ -128,6 +128,12 @@ public class CallIntegrationConnectionService extends ConnectionService {
                 final var proposal =
                         service.getJingleConnectionManager()
                                 .proposeJingleRtpSession(account, with, media);
+                if (proposal == null) {
+                    // TODO instead of just null checking try to get the sessionID
+                    return Connection.createFailedConnection(
+                            new DisconnectCause(
+                                    DisconnectCause.ERROR, "a call is already in progress"));
+                }
                 intent.putExtra(
                         RtpSessionActivity.EXTRA_LAST_REPORTED_STATE,
                         RtpEndUserState.FINDING_DEVICE.toString());
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java
index ce3628697..b1545a2fc 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java
@@ -4,6 +4,8 @@ import android.telecom.VideoProfile;
 import android.util.Base64;
 import android.util.Log;
 
+import androidx.annotation.Nullable;
+
 import com.google.common.base.Objects;
 import com.google.common.base.Optional;
 import com.google.common.base.Preconditions;
@@ -727,7 +729,7 @@ public class JingleConnectionManager extends AbstractConnectionManager {
         return rtpConnection;
     }
 
-    public RtpSessionProposal proposeJingleRtpSession(
+    public @Nullable RtpSessionProposal proposeJingleRtpSession(
             final Account account, final Jid with, final Set<Media> media) {
         synchronized (this.rtpSessionProposals) {
             for (final Map.Entry<RtpSessionProposal, DeviceDiscoveryState> entry :