Consider case when checking giphy/gif me command.

GiphyMessages/GiphyMessages/Info.plist

@@ -17,11 +17,11 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.3</string>
+	<string>1.4</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>4</string>
+	<string>5</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.entertainment</string>
 	<key>LSMinimumSystemVersion</key>

GiphyMessages/GiphyScripts/Giphy.applescript

@@ -10,17 +10,19 @@
 using terms from application "Messages"
 	on message sent theMessage for theChat with theText
 		set theChatId to (get id of theChat)
-
-		if theMessage starts with "gif me" or theMessage starts with "giphy" then
-			try
-				set theQuotedMessage to quoted form of theMessage
-				set theQuotedChatId to quoted form of theChatId
-				set theScript to "/Applications/Giphy\\ Messages.app/Contents/Resources/giphy.py"
-
-				do shell script "python " & theScript & " " & theQuotedMessage & " " & theQuotedChatId & " &>/dev/null &"
-			on error err
-			end try
-		end if
+
+        considering case
+            if theMessage starts with "gif me" or theMessage starts with "giphy" then
+                try
+                    set theQuotedMessage to quoted form of theMessage
+                    set theQuotedChatId to quoted form of theChatId
+                    set theScript to "/Applications/Giphy\\ Messages.app/Contents/Resources/giphy.py"
+
+                    do shell script "python " & theScript & " " & theQuotedMessage & " " & theQuotedChatId & " &>/dev/null &"
+                    on error err
+                end try
+            end if
+        end considering
 
 		return theMessage
 	end message sent