diff --git a/coreapi/linphonecore_jni.cc b/coreapi/linphonecore_jni.cc
index 23d32d13b..9384d3dd1 100644
--- a/coreapi/linphonecore_jni.cc
+++ b/coreapi/linphonecore_jni.cc
@@ -3122,13 +3122,21 @@ extern "C" void Java_org_linphone_core_LpConfigImpl_setString(JNIEnv *env, jobje
 
 extern "C" jstring Java_org_linphone_core_LpConfigImpl_getString(JNIEnv *env, jobject thiz, jlong lpc,
         jstring section, jstring key, jstring defaultValue) {
-        const char *csection = env->GetStringUTFChars(section, NULL);
+		const char *csection = env->GetStringUTFChars(section, NULL);
         const char *ckey = env->GetStringUTFChars(key, NULL);
-        const char *cvalue = env->GetStringUTFChars(defaultValue, NULL);
-        const char *returnValue = lp_config_get_string((LpConfig *)lpc, csection, ckey, cvalue);
+		const char *cvalue;	
+		if (defaultValue == NULL) {
+			cvalue = NULL;
+		} else {
+        	cvalue = env->GetStringUTFChars(defaultValue, NULL);
+        }
+
+		const char *returnValue = lp_config_get_string((LpConfig *)lpc, csection, ckey, cvalue);
+
         env->ReleaseStringUTFChars(section, csection);
         env->ReleaseStringUTFChars(key, ckey);
-        env->ReleaseStringUTFChars(defaultValue, cvalue);
+		if (cvalue)
+        	env->ReleaseStringUTFChars(defaultValue, cvalue);
         return returnValue ? env->NewStringUTF(returnValue) : NULL;
 }
 extern "C" void Java_org_linphone_core_LpConfigImpl_setIntRange(JNIEnv *env, jobject thiz, jlong lpc,