diff --git a/pycrate_corenet/ProcCNHnbap.py b/pycrate_corenet/ProcCNHnbap.py
index 8d607a9..9ade20f 100644
--- a/pycrate_corenet/ProcCNHnbap.py
+++ b/pycrate_corenet/ProcCNHnbap.py
@@ -469,7 +469,7 @@ class HNBAPErrorIndHNB(HNBAPSigProc):
     
     def recv(self, pdu_rx):
         self._recv(pdu_rx)
-        if not self.errcause:
+        if not self.errcause and 'Cause' in self.HNBInfo:
             self._log('WNG', 'error ind received: %s.%s' % self.HNBInfo['Cause'])
             # if it corresponds to a previously CN-initiated class 1 procedure
             # abort it
diff --git a/pycrate_corenet/ProcCNNgap.py b/pycrate_corenet/ProcCNNgap.py
index 28fcf9a..8c3a907 100644
--- a/pycrate_corenet/ProcCNNgap.py
+++ b/pycrate_corenet/ProcCNNgap.py
@@ -1572,7 +1572,7 @@ class NGAPErrorIndNonUERAN(NGAPNonUESigProc):
     
     def recv(self, pdu):
         self._recv(pdu)
-        if not self.errcause:
+        if not self.errcause and 'Cause' in self.GNBInfo:
             self._log('WNG', 'error ind received: %r' % (self.GNBInfo['Cause'], ))
             # if it corresponds to a said-unknown UE ID, disconnect the UE instance
             if self.GNBInfo['Cause'] == ('radioNetwork', 'unknown-local-UE-NGAP-ID') \
diff --git a/pycrate_corenet/ProcCNRanap.py b/pycrate_corenet/ProcCNRanap.py
index d171050..3efe7cf 100644
--- a/pycrate_corenet/ProcCNRanap.py
+++ b/pycrate_corenet/ProcCNRanap.py
@@ -2075,7 +2075,7 @@ class RANAPErrorIndRNC(RANAPSigProc):
     
     def recv(self, pdu):
         self._recv(pdu)
-        if not self.errcause is None:
+        if not self.errcause is None and 'Cause' in self.UEInfo:
             self._log('WNG', 'error ind received: %s.%i' % self.UEInfo['Cause'])
             # if it corresponds to a previously CN-initiated class 1 procedure
             # abort it
diff --git a/pycrate_corenet/ProcCNS1ap.py b/pycrate_corenet/ProcCNS1ap.py
index d420bb5..bd1cc27 100644
--- a/pycrate_corenet/ProcCNS1ap.py
+++ b/pycrate_corenet/ProcCNS1ap.py
@@ -1762,7 +1762,7 @@ class S1APErrorIndNonUEENB(S1APNonUESigProc):
     
     def recv(self, pdu):
         self._recv(pdu)
-        if not self.errcause:
+        if not self.errcause and 'Cause' in self.ENBInfo:
             self._log('WNG', 'error ind received: %r' % (self.ENBInfo['Cause'], ))
             # if it corresponds to an said-unknown UE ID, disconnect the UE instance
             if self.ENBInfo['Cause'] == ('radioNetwork', 'unknown-enb-ue-s1ap-id') \