diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuConfig.java b/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuConfig.java
index ddfc69a4dd..48d0d3efb3 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuConfig.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuConfig.java
@@ -1,3 +1,27 @@
+/*
+ * Copyright (c) 2019, gazivodag <https://github.com/gazivodag>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 package net.runelite.client.plugins.runedoku;
 
 import java.awt.Color;
diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuUtil.java b/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuUtil.java
index 94cae519be..8dba20275d 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuUtil.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/runedoku/RunedokuUtil.java
@@ -1,3 +1,27 @@
+/*
+ * Copyright (c) 2019, gazivodag <https://github.com/gazivodag>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 package net.runelite.client.plugins.runedoku;
 
 import java.awt.Color;
@@ -138,7 +162,14 @@ class RunedokuUtil
 				item = sudokuScreen.getWidgetItem(myIndex);
 				if (item != null)
 				{
-					myArr[i][ii] = RunedokuPiece.getById(item.getId()).getPieceForSudoku();
+					if (item.getId() != -1)
+					{
+						myArr[i][ii] = RunedokuPiece.getById(item.getId()).getPieceForSudoku();
+					}
+					else
+					{
+						myArr[i][ii] = 0;
+					}
 				}
 				else
 				{