Index: src/pmc/continuation.pmc
===================================================================
--- src/pmc/continuation.pmc	(revision 42892)
+++ src/pmc/continuation.pmc	(working copy)
@@ -248,6 +248,11 @@
                 PMC *raw_sig, *invalid_sig;
                 Parrot_pcc_parse_signature_string(INTERP, string_sig, &raw_sig, &invalid_sig);
 
+                /* Attempting to call an uninitialised Continuation */
+                if(!pc)
+                    Parrot_ex_throw_from_c_args(INTERP, NULL, EXCEPTION_INVALID_OPERATION,
+                            "Continuation: Attempting to invoke an uninitialised exception!");
+
                 /* Build results signature for continuation */
                 if (*pc == PARROT_OP_get_results_pc)
                     call_obj = Parrot_pcc_build_sig_object_returns_from_op(INTERP, call_obj,