Prevents loading of gate files using non-blocks as part of the border

README.md

@@ -395,6 +395,7 @@ portalInfoServer=Server: %server%
   players accidentally losing the creatures during teleportation
 - Fixes a potential exception when a gate's open-block or closed-block is set to a material which isn't a block
 - Fixes a potential exception when a portal without a sign has an invalid gate type
+- Prevents loading of gate files using non-blocks as part of the border
 
 #### \[Version 0.9.2.1] EpicKnarvik97 fork
 

src/main/java/net/knarcraft/stargate/portal/property/gate/Gate.java

@@ -69,6 +69,15 @@ public class Gate {
         return layout;
     }
 
+    /**
+     * Gets a copy of the character to material mapping for this gate
+     *
+     * @return <p>The character to material map</p>
+     */
+    public Map<Character, Material> getCharacterMaterialMap() {
+        return new HashMap<>(characterMaterialMap);
+    }
+
     /**
      * Gets the material type used for this gate's control blocks
      *

src/main/java/net/knarcraft/stargate/portal/property/gate/GateHandler.java

@@ -209,6 +209,14 @@ public class GateHandler {
             Stargate.logSevere(String.format(failString, "Gate closed block must be a type of block."));
             return false;
         }
+
+        for (Material material : gate.getCharacterMaterialMap().values()) {
+            if (!material.isBlock()) {
+                Stargate.logSevere(String.format(failString, "Every gate border block must be a type of block."));
+                return false;
+            }
+        }
+
         return true;
     }