diff --git a/Mage.Tests/src/test/java/org/mage/test/utils/CardHintsTest.java b/Mage.Tests/src/test/java/org/mage/test/utils/CardHintsTest.java
index 2664737b5203..92d2cb1c7574 100644
--- a/Mage.Tests/src/test/java/org/mage/test/utils/CardHintsTest.java
+++ b/Mage.Tests/src/test/java/org/mage/test/utils/CardHintsTest.java
@@ -16,6 +16,9 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
+/**
+ * @author JayDi85
+ */
 public class CardHintsTest extends CardTestCommanderDuelBase {
 
     // html logs/names used all around xmage (game logs, chats, choose dialogs, etc)
@@ -114,7 +117,7 @@ public void test_ObjectNamesInHtml() {
         setStopAt(1, PhaseStep.DECLARE_ATTACKERS);
         execute();
 
-        // colleat all possible objects and test logs with it
+        // collect all possible objects and test logs with it
         List<MageObject> sampleObjects = new ArrayList<>();
         sampleObjects.addAll(currentGame.getBattlefield().getAllPermanents());
         sampleObjects.addAll(playerA.getHand().getCards(currentGame));
diff --git a/Mage/src/main/java/mage/abilities/condition/common/SourceMatchesFilterCondition.java b/Mage/src/main/java/mage/abilities/condition/common/SourceMatchesFilterCondition.java
index 95f803651432..f0ab7eaa1b7b 100644
--- a/Mage/src/main/java/mage/abilities/condition/common/SourceMatchesFilterCondition.java
+++ b/Mage/src/main/java/mage/abilities/condition/common/SourceMatchesFilterCondition.java
@@ -21,6 +21,9 @@ public SourceMatchesFilterCondition(FilterPermanent filter) {
     }
 
     public SourceMatchesFilterCondition(String text, FilterPermanent filter) {
+        if (filter == null) {
+            throw new IllegalArgumentException("Wrong code usage: filter param can't be empty");
+        }
         this.FILTER = filter;
         this.text = text;
     }