diff --git a/lib/robot.js b/lib/robot.js
index ab442a1..db6e14e 100644
--- a/lib/robot.js
+++ b/lib/robot.js
@@ -296,7 +296,11 @@ namespace("Cylon", function() {
         try {
           return this.adaptors[adaptorName] = require(moduleName);
         } catch (e) {
-          this._missingModuleError(moduleName);
+          if (e.code === "MODULE_NOT_FOUND") {
+            this._missingModuleError(moduleName);
+          } else {
+            throw e;
+          }
         }
       }
     };
@@ -354,7 +358,11 @@ namespace("Cylon", function() {
         try {
           return this.drivers[driverName] = require(moduleName);
         } catch (e) {
-          this._missingModuleError(moduleName);
+          if (e.code === "MODULE_NOT_FOUND") {
+            this._missingModuleError(moduleName);
+          } else {
+            throw e;
+          }
         }
       }
     };