diff --git a/lib/vmpooler/vsphere_helper.rb b/lib/vmpooler/vsphere_helper.rb
index 68db65d..3ad8843 100644
--- a/lib/vmpooler/vsphere_helper.rb
+++ b/lib/vmpooler/vsphere_helper.rb
@@ -181,7 +181,7 @@ module Vmpooler
         if base.is_a? RbVmomi::VIM::Folder
           base = base.childEntity.find { |f| f.name == folder }
         else
-          abort "Unexpected object type encountered (#{base.class}) while finding folder"
+          raise(RuntimeError, "Unexpected object type encountered (#{base.class}) while finding folder")
         end
       end
 
@@ -284,7 +284,7 @@ module Vmpooler
           when base.is_a?(RbVmomi::VIM::ResourcePool)
             base = base.resourcePool.find { |f| f.name == pool }
           else
-            abort "Unexpected object type encountered (#{base.class}) while finding resource pool"
+            raise(RuntimeError, "Unexpected object type encountered (#{base.class}) while finding resource pool")
         end
       end