diff --git a/src/main/java/org/robotframework/javalib/reflection/ArgumentConverter.java b/src/main/java/org/robotframework/javalib/reflection/ArgumentConverter.java
index 6c8f647..ae61ca2 100644
--- a/src/main/java/org/robotframework/javalib/reflection/ArgumentConverter.java
+++ b/src/main/java/org/robotframework/javalib/reflection/ArgumentConverter.java
@@ -41,7 +41,7 @@ private boolean shouldConvert(Object[] args) {
     }
 
     private boolean isArrayArgument(Object object) {
-        return object.getClass().isArray();
+        return object != null && object.getClass().isArray();
     }
 
     private Object convertToType(Class<?> clazz, Object object) {