diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java b/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
index 75cfa4b5f..99e23bf56 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
@@ -217,6 +217,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(TObject[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -230,6 +233,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(boolean[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -243,6 +249,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(byte[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -256,6 +265,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(short[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -269,6 +281,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(char[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -282,6 +297,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(int[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -295,6 +313,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(long[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -308,6 +329,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(float[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -321,6 +345,9 @@ public class TArrays extends TObject {
     }
 
     public static String toString(double[] a) {
+        if (a == null) {
+            return "null";
+        }
         TStringBuilder sb = new TStringBuilder();
         sb.append("[");
         for (int i = 0; i < a.length; ++i) {
@@ -1552,6 +1579,9 @@ public class TArrays extends TObject {
     }
 
     public static String deepToString(Object[] a) {
+        if (a == null) {
+            return "null";
+        }
         StringBuilder sb = new StringBuilder();
         deepToString(a, sb, new TArrayList<>());
         return sb.toString();