diff --git a/src/main/java/com/zegoggles/smssync/mail/MessageGenerator.java b/src/main/java/com/zegoggles/smssync/mail/MessageGenerator.java
index fd5db44c3..3480b24d9 100644
--- a/src/main/java/com/zegoggles/smssync/mail/MessageGenerator.java
+++ b/src/main/java/com/zegoggles/smssync/mail/MessageGenerator.java
@@ -161,7 +161,7 @@ public MessageGenerator(Context context,
         final String address = msgMap.get(CallLog.Calls.NUMBER);
         final int callType = toInt(msgMap.get(CallLog.Calls.TYPE));
 
-        if (TextUtils.isEmpty(address) || !mCallLogTypes.isTypeEnabled(callType)) {
+        if (!mCallLogTypes.isTypeEnabled(callType)) {
             if (LOCAL_LOGV) Log.v(TAG, "ignoring call log entry: " + msgMap);
             return null;
         }
diff --git a/src/test/java/com/zegoggles/smssync/mail/MessageGeneratorTest.java b/src/test/java/com/zegoggles/smssync/mail/MessageGeneratorTest.java
index 4236074f2..357fae303 100644
--- a/src/test/java/com/zegoggles/smssync/mail/MessageGeneratorTest.java
+++ b/src/test/java/com/zegoggles/smssync/mail/MessageGeneratorTest.java
@@ -127,6 +127,15 @@ public class MessageGeneratorTest {
         assertThat(msg.getRecipients(Message.RecipientType.TO)[0]).isEqualTo(me);
     }
 
+    @Test public void testShouldGenerateMessageForCallLogIncomingUnknown() throws Exception {
+        PersonRecord record = new PersonRecord(0, null, null, "-1");
+        Message msg = generator.messageForDataType(mockCalllogMessage("", CallLog.Calls.INCOMING_TYPE, record), DataType.CALLLOG);
+        assertThat(msg).isNotNull();
+        assertThat(msg.getSubject()).isEqualTo("Call with Unknown");
+        assertThat(msg.getFrom()[0].toString()).isEqualTo("Unknown <unknown.number@unknown.email>");
+        assertThat(msg.getRecipients(Message.RecipientType.TO)[0]).isEqualTo(me);
+    }
+
     @Test public void testShouldGenerateCallLogMessageWithCorrectEncoding() throws Exception {
         PersonRecord record = new PersonRecord(-1, "Test Testor", null, null);
         Message msg = generator.messageForDataType(mockCalllogMessage("1234", CallLog.Calls.OUTGOING_TYPE, record), DataType.CALLLOG);