diff --git a/plugin/syntastic.vim b/plugin/syntastic.vim
index 4d827ef4..bc990102 100644
--- a/plugin/syntastic.vim
+++ b/plugin/syntastic.vim
@@ -19,7 +19,7 @@ if has('reltime')
     lockvar! g:_SYNTASTIC_START
 endif
 
-let g:_SYNTASTIC_VERSION = '3.6.0-143'
+let g:_SYNTASTIC_VERSION = '3.6.0-144'
 lockvar g:_SYNTASTIC_VERSION
 
 " Sanity checks {{{1
diff --git a/syntax_checkers/javascript/jsxhint.vim b/syntax_checkers/javascript/jsxhint.vim
index 480c62c7..608fa6ef 100644
--- a/syntax_checkers/javascript/jsxhint.vim
+++ b/syntax_checkers/javascript/jsxhint.vim
@@ -18,6 +18,10 @@ let s:save_cpo = &cpo
 set cpo&vim
 
 function! SyntaxCheckers_javascript_jsxhint_IsAvailable() dict
+    if !executable(self.getExec())
+        return 0
+    endif
+
     let version_output = syntastic#util#system(self.getExecEscaped() . ' --version')
     let parsed_ver = !v:shell_error && (version_output =~# '\m^JSXHint\>') ? syntastic#util#parseVersion(version_output) : []
     if len(parsed_ver)
diff --git a/syntax_checkers/typescript/tsc.vim b/syntax_checkers/typescript/tsc.vim
index 0aa2b114..3b81e266 100644
--- a/syntax_checkers/typescript/tsc.vim
+++ b/syntax_checkers/typescript/tsc.vim
@@ -18,6 +18,10 @@ let s:save_cpo = &cpo
 set cpo&vim
 
 function! SyntaxCheckers_typescript_tsc_IsAvailable() dict
+    if !executable(self.getExec())
+        return 0
+    endif
+
     let version_output = split(syntastic#util#system(self.getExecEscaped() . ' --version'), '\n', 1)
     let ver = filter(copy(version_output), 'v:val =~# ''\m\<Version ''')
     let parsed_ver = len(ver) ? syntastic#util#parseVersion(ver[0], '\v<Version \zs\d+(\.\d+)\ze') : []