diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f653c594..499d30d3d 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,8 @@
 ### 1.9.9
 
 - Fixed Refined Storage sidebuttons displaying over the JEI bookmark pagination buttons (raoulvdberge)
-- Fixed Issue where Crafters may fail to recognize an inventory/tank for some Patterns (Darkere) 
+- Fixed issue where Crafters may fail to recognize an inventory/tank for some patterns (Darkere) 
+- Fixed issue where the Crafter Manager can crash on invalid patterns (raoulvdberge)
 
 ### 1.9.8
 
diff --git a/src/main/java/com/refinedmods/refinedstorage/container/CrafterManagerContainer.java b/src/main/java/com/refinedmods/refinedstorage/container/CrafterManagerContainer.java
index 79bae99d8..c1d4dbe8b 100644
--- a/src/main/java/com/refinedmods/refinedstorage/container/CrafterManagerContainer.java
+++ b/src/main/java/com/refinedmods/refinedstorage/container/CrafterManagerContainer.java
@@ -120,13 +120,15 @@ public class CrafterManagerContainer extends BaseContainer {
 
                         visible = false;
 
-                        for (ItemStack output : pattern.getOutputs()) {
-                            ItemGridStack outputConverted = new ItemGridStack(output);
+                        if (pattern.isValid()) {
+                            for (ItemStack output : pattern.getOutputs()) {
+                                ItemGridStack outputConverted = new ItemGridStack(output);
 
-                            for (Predicate<IGridStack> filter : filters) {
-                                if (filter.test(outputConverted)) {
-                                    visible = true;
-                                    break;
+                                for (Predicate<IGridStack> filter : filters) {
+                                    if (filter.test(outputConverted)) {
+                                        visible = true;
+                                        break;
+                                    }
                                 }
                             }
                         }