1 files changed, 6 insertions, 0 deletions
diff --git a/join.rb b/join.rb
index 4d20731..945556a 100644
--- a/join.rb
+++ b/join.rb
@@ -19,6 +19,12 @@ module Puppet::Parser::Functions
 
     suffix = arguments[1] if arguments[1]
 
+    if suffix
+      unless suffix.is_a?(String)
+        raise(Puppet::ParseError, 'join(): Requires string to work with')
+      end
+    end
+
     result = suffix ? array.join(suffix) : array.join
 
     return result