diff --git a/Tag.cpp b/Tag.cpp
index aa91d8f..50012b0 100644
--- a/Tag.cpp
+++ b/Tag.cpp
@@ -50,7 +50,10 @@ namespace jet {
 		 if(!finished) {
 		    coreutils::ZString keywordName = in.getTokenInclude("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_");
 		    if(in.ifNext("=\"")) {
-		       variables[keywordName] = in.getTokenExclude("\"");
+		       if(variables.count(keywordName) == 0)
+			 variables[keywordName] = in.getTokenExclude("\"");
+		       else
+			 throw coreutils::Exception("keyword name must be unique for tag.");
 		    }
 		    if(!in.ifNext("\"")) {}
 		 }
diff --git a/__call.cpp b/__call.cpp
index d960edf..f3e8b5d 100644
--- a/__call.cpp
+++ b/__call.cpp
@@ -51,7 +51,7 @@ namespace jet {
       close(fdo[1]);
       if(variableDefined("name")) {
 	 resolveKeyword("name");
-	 if(!variableDefined("scope") && (variables["scope"] == "global"))
+	 if(!variableDefined("scope") || (variables["scope"] == "global"))
 	   global.variables[variables["name"]].read(fdo[0]);
 	 else if(variables["scope"] == "local") 
 	   parent->variables[variables["name"]].read(fdo[0]);