diff --git a/ChangeLog.md b/ChangeLog.md
index a7271d4f..731e6507 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,6 @@
+#2.4.1
+  * Small patches and changes  
+
 #2.4.0
   * Changed compression library to Pako
   * Use coriolis-data 2.4.0
diff --git a/package.json b/package.json
index 7d8da939..e624e1d1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "coriolis_shipyard",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "repository": {
     "type": "git",
     "url": "https://github.com/EDCD/coriolis"
diff --git a/src/app/components/AvailableModulesMenu.jsx b/src/app/components/AvailableModulesMenu.jsx
index 3d8d4d78..37fb865a 100644
--- a/src/app/components/AvailableModulesMenu.jsx
+++ b/src/app/components/AvailableModulesMenu.jsx
@@ -20,6 +20,7 @@ const GRPCAT = {
   'fx': 'limpet controllers',
   'hb': 'limpet controllers',
   'pc': 'limpet controllers',
+  'rpl': 'limpet controllers',
   'pce': 'passenger cabins',
   'pci': 'passenger cabins',
   'pcm': 'passenger cabins',
@@ -60,7 +61,7 @@ const CATEGORIES = {
   'fi': ['fi'],
   'fuel': ['ft', 'fs'],
   'hangars': ['fh', 'pv'],
-  'limpet controllers': ['cc', 'fx', 'hb', 'pc'],
+  'limpet controllers': ['cc', 'fx', 'hb', 'pc', 'rpl'],
   'passenger cabins': ['pce', 'pci', 'pcm', 'pcq'],
   'rf': ['rf'],
   'shields': ['sg', 'bsg', 'psg', 'scb'],
@@ -148,7 +149,7 @@ export default class AvailableModulesMenu extends TranslatedComponent {
         const existing = catmodules[moduleCategory] || [];
         catmodules[moduleCategory] = existing.concat(modules[g]);
       }
-      
+
       for (let category in catmodules) {
         let categoryHeader = false;
         // Order through CATEGORIES if present
diff --git a/src/app/components/InternalSlot.jsx b/src/app/components/InternalSlot.jsx
index 9f06fa5d..90c96279 100644
--- a/src/app/components/InternalSlot.jsx
+++ b/src/app/components/InternalSlot.jsx
@@ -26,7 +26,7 @@ export default class InternalSlot extends Slot {
       let classRating = m.class + m.rating;
       let { drag, drop, ship } = this.props;
       let { termtip, tooltip } = this.context;
-      let validMods = Modifications.modules[m.grp].modifications || [];
+      let validMods = (Modifications.modules[m.grp] ? Modifications.modules[m.grp].modifications : []);
       let showModuleResistances = Persist.showModuleResistances();
 
       // Modifications tooltip shows blueprint and grade, if available