diff --git a/src/SlashCommands.tsx b/src/SlashCommands.tsx
index 15798ae3b1..7ebdc4ee3b 100644
--- a/src/SlashCommands.tsx
+++ b/src/SlashCommands.tsx
@@ -118,7 +118,7 @@ export class Command {
 
     run(roomId: string, args: string, cmd: string) {
         // if it has no runFn then its an ignored/nop command (autocomplete only) e.g `/me`
-        if (!this.runFn) return;
+        if (!this.runFn) return reject(_t("Command error"));
         return this.runFn.bind(this)(roomId, args, cmd);
     }
 
diff --git a/src/editor/serialize.ts b/src/editor/serialize.ts
index 4d0b8cd03a..fc35f1e2ea 100644
--- a/src/editor/serialize.ts
+++ b/src/editor/serialize.ts
@@ -62,16 +62,20 @@ export function textSerialize(model: EditorModel) {
 }
 
 export function containsEmote(model: EditorModel) {
-    return startsWith(model, "/me ");
+    return startsWith(model, "/me ", false);
 }
 
-export function startsWith(model: EditorModel, prefix: string) {
+export function startsWith(model: EditorModel, prefix: string, caseSensitive = true) {
     const firstPart = model.parts[0];
     // part type will be "plain" while editing,
     // and "command" while composing a message.
-    return firstPart &&
-        (firstPart.type === "plain" || firstPart.type === "command") &&
-        firstPart.text.startsWith(prefix);
+    let text = firstPart && firstPart.text;
+    if (!caseSensitive) {
+        prefix = prefix.toLowerCase();
+        text = text.toLowerCase();
+    }
+
+    return firstPart && (firstPart.type === "plain" || firstPart.type === "command") && text.startsWith(prefix);
 }
 
 export function stripEmoteCommand(model: EditorModel) {
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 4a2c882c54..5de33ada55 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -148,6 +148,7 @@
     "Actions": "Actions",
     "Advanced": "Advanced",
     "Other": "Other",
+    "Command error": "Command error",
     "Usage": "Usage",
     "Prepends ¯\\_(ツ)_/¯ to a plain-text message": "Prepends ¯\\_(ツ)_/¯ to a plain-text message",
     "Sends a message as plain text, without interpreting it as markdown": "Sends a message as plain text, without interpreting it as markdown",
@@ -1170,7 +1171,6 @@
     "All Rooms": "All Rooms",
     "Search…": "Search…",
     "Server error": "Server error",
-    "Command error": "Command error",
     "Server unavailable, overloaded, or something else went wrong.": "Server unavailable, overloaded, or something else went wrong.",
     "Unknown Command": "Unknown Command",
     "Unrecognised command: %(commandText)s": "Unrecognised command: %(commandText)s",