diff --git a/sdk/android/api/org/webrtc/CallSessionFileRotatingLogSink.java b/sdk/android/api/org/webrtc/CallSessionFileRotatingLogSink.java
index c6b9e97e7d..f4edb58847 100644
--- a/sdk/android/api/org/webrtc/CallSessionFileRotatingLogSink.java
+++ b/sdk/android/api/org/webrtc/CallSessionFileRotatingLogSink.java
@@ -14,11 +14,17 @@ public class CallSessionFileRotatingLogSink {
   private long nativeSink;
 
   public static byte[] getLogData(String dirPath) {
+    if (dirPath == null) {
+      throw new IllegalArgumentException("dirPath may not be null.");
+    }
     return nativeGetLogData(dirPath);
   }
 
   public CallSessionFileRotatingLogSink(
       String dirPath, int maxFileSize, Logging.Severity severity) {
+    if (dirPath == null) {
+      throw new IllegalArgumentException("dirPath may not be null.");
+    }
     nativeSink = nativeAddSink(dirPath, maxFileSize, severity.ordinal());
   }