X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fpolynomial%2Fcollect_vargs.cpp;h=259326873bf1da4fd6866a8d2267ec0a13665264;hp=89c3b8bec49321e8adffc70df2db2e8d94f4be9a;hb=c13d5e0ed2ce6223bc6c4340bb00daf2e24ea923;hpb=f28f24cf1228f0fa9cb0889d87a3f4039587ff92

diff --git a/ginac/polynomial/collect_vargs.cpp b/ginac/polynomial/collect_vargs.cpp
index 89c3b8be..25932687 100644
--- a/ginac/polynomial/collect_vargs.cpp
+++ b/ginac/polynomial/collect_vargs.cpp
@@ -148,8 +148,14 @@ ex_collect_to_ex(const ex_collect_t& ec, const GiNaC::exvector& vars)
 		exvector tv;
 		tv.reserve(vars.size() + 1);
 		for (std::size_t j = 0; j < vars.size(); ++j) {
-			if (ec[i].first[j] != 0)
-				tv.push_back(power(vars[j], ec[i].first[j]));
+			const exp_vector_t& exp_vector(ec[i].first);
+
+			bug_on(exp_vector.size() != vars.size(),
+				"expected " << vars.size() << " variables, "
+				"expression has " << exp_vector.size() << " instead");
+
+			if (exp_vector[j] != 0)
+				tv.push_back(power(vars[j], exp_vector[j]));
 		}
 		tv.push_back(ec[i].second);
 		ex tmp = (new mul(tv))->setflag(status_flags::dynallocated);