diff --git a/src/com/android/stk/StkAppService.java b/src/com/android/stk/StkAppService.java
index c2c8874..c8c8e38 100755
--- a/src/com/android/stk/StkAppService.java
+++ b/src/com/android/stk/StkAppService.java
@@ -313,6 +313,7 @@
                 //If all StkServices are not available, stop itself and uninstall apk.
                 for (i = PhoneConstants.SIM_ID_1; i < mSimCount; i++) {
                     if (i != slotId
+                            && (mStkService[i] != null)
                             && (mStkContext[i].mStkServiceState == STATE_UNKNOWN
                             || mStkContext[i].mStkServiceState == STATE_EXIST)) {
                        break;