diff --git a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
index 8629eb8..ce01ae5 100644
--- a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
+++ b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
@@ -65,8 +65,8 @@
 command -nargs=+ -complete=file -bang TermdebugCommand call s:StartDebugCommand(<bang>0, <f-args>)
 
 " Name of the gdb command, defaults to "gdb".
-if !exists('termdebugger')
-  let termdebugger = 'gdb'
+if !exists('g:termdebugger')
+  let g:termdebugger = 'gdb'
 endif
 
 let s:pc_id = 12
@@ -104,9 +104,14 @@
 
 func s:StartDebug_internal(dict)
   if exists('s:gdbwin')
-    echoerr 'Terminal debugger already running'
+    echoerr 'Terminal debugger already running, cannot run two'
     return
   endif
+  if !executable(g:termdebugger)
+    echoerr 'Cannot execute debugger program "' .. g:termdebugger .. '"'
+    return
+  endif
+
   let s:ptywin = 0
   let s:pid = 0
 
diff --git a/src/version.c b/src/version.c
index f5b9d60..fe9cee3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2103,
+/**/
     2102,
 /**/
     2101,