diff --git a/libs/zita-resampler/vmresampler.cc b/libs/zita-resampler/vmresampler.cc
index 9193d09cd6..87a68d371b 100644
--- a/libs/zita-resampler/vmresampler.cc
+++ b/libs/zita-resampler/vmresampler.cc
@@ -169,7 +169,13 @@ VMResampler::process (void)
 	double         ph, dp;
 	float          a, *p1, *p2;
 
-	if (!_table) return 1;
+	if (!_table) {
+		n = std::min (inp_count, out_count);
+		memcpy (out_data, inp_data, n * sizeof (float));
+		out_count -= n;
+		inp_count -= n;
+		return 1;
+	}
 
 	const int hl = _table->_hl;
 	const unsigned int np = _table->_np;
@@ -208,6 +214,7 @@ VMResampler::process (void)
 			out_count -= to_proc;
 			in        += to_proc;
 			if (in >= _inmax) {
+				// assert (_inmax == in)
 				memcpy (_buff, _buff + in, (2 * hl - 1) * sizeof (float));
 				in = 0;
 			}