diff --git a/generators/php/procedures.js b/generators/php/procedures.js
index 791015a02..ac4f0244e 100644
--- a/generators/php/procedures.js
+++ b/generators/php/procedures.js
@@ -34,7 +34,8 @@ Blockly.PHP['procedures_defreturn'] = function(block) {
   // a local parameter.
   var globals = [];
   var varName;
-  var variables = workspace.getAllVariables();
+  var workspace = block.workspace;
+  var variables = workspace.getAllVariables() || [];
   for (var i = 0, variable; variable = variables[i]; i++) {
     varName = variable.name;
     if (block.arguments_.indexOf(varName) == -1) {
diff --git a/generators/python/procedures.js b/generators/python/procedures.js
index 311ebefec..10d279a90 100644
--- a/generators/python/procedures.js
+++ b/generators/python/procedures.js
@@ -35,7 +35,8 @@ Blockly.Python['procedures_defreturn'] = function(block) {
   // a local parameter.
   var globals = [];
   var varName;
-  var variables = workspace.getAllVariables();
+  var workspace = block.workspace;
+  var variables = workspace.getAllVariables() || [];
   for (var i = 0, variable; variable = variables[i]; i++) {
     varName = variable.name;
     if (block.arguments_.indexOf(varName) == -1) {