diff --git a/services/core/java/com/android/server/TelephonyRegistry.java b/services/core/java/com/android/server/TelephonyRegistry.java
index cfd22e841a99d..a66e5980839d3 100644
--- a/services/core/java/com/android/server/TelephonyRegistry.java
+++ b/services/core/java/com/android/server/TelephonyRegistry.java
@@ -846,7 +846,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
             mCallForwarding[i] =  false;
             mCellIdentity[i] = null;
             mCellInfo.add(i, Collections.EMPTY_LIST);
-            mImsReasonInfo.add(i, null);
+            mImsReasonInfo.add(i, new ImsReasonInfo());
             mSrvccState[i] = TelephonyManager.SRVCC_STATE_HANDOVER_NONE;
             mCallDisconnectCause[i] = DisconnectCause.NOT_VALID;
             mCallPreciseDisconnectCause[i] = PreciseDisconnectCause.NOT_VALID;
@@ -1265,10 +1265,13 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
                     }
                 }
                 if (events.contains(TelephonyCallback.EVENT_IMS_CALL_DISCONNECT_CAUSE_CHANGED)) {
-                    try {
-                        r.callback.onImsCallDisconnectCauseChanged(mImsReasonInfo.get(r.phoneId));
-                    } catch (RemoteException ex) {
-                        remove(r.binder);
+                    ImsReasonInfo imsReasonInfo = mImsReasonInfo.get(r.phoneId);
+                    if (imsReasonInfo != null) {
+                        try {
+                            r.callback.onImsCallDisconnectCauseChanged(imsReasonInfo);
+                        } catch (RemoteException ex) {
+                            remove(r.binder);
+                        }
                     }
                 }
                 if (events.contains(
@@ -2418,6 +2421,11 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
         int phoneId = getPhoneIdFromSubId(subId);
         synchronized (mRecords) {
             if (validatePhoneId(phoneId)) {
+                if (imsReasonInfo == null) {
+                    loge("ImsReasonInfo is null, subId=" + subId + ", phoneId=" + phoneId);
+                    mImsReasonInfo.set(phoneId, new ImsReasonInfo());
+                    return;
+                }
                 mImsReasonInfo.set(phoneId, imsReasonInfo);
                 for (Record r : mRecords) {
                     if (r.matchTelephonyCallbackEvent(