diff --git a/src/ivfkmeans.c b/src/ivfkmeans.c
index 35f32d1..cddd724 100644
--- a/src/ivfkmeans.c
+++ b/src/ivfkmeans.c
@@ -251,7 +251,7 @@ ElkanKmeans(Relation index, VectorArray samples, VectorArray centers)
 	for (j = 0; j < numSamples; j++)
 	{
 		minDistance = DBL_MAX;
-		closestCenter = -1;
+		closestCenter = 0;
 
 		/* Find closest center */
 		for (k = 0; k < numCenters; k++)
diff --git a/src/vector.c b/src/vector.c
index 392d98a..5e1e0b6 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -330,7 +330,10 @@ vector_recv(PG_FUNCTION_ARGS)
 
 	result = InitVector(dim);
 	for (i = 0; i < dim; i++)
+	{
 		result->x[i] = pq_getmsgfloat4(buf);
+		CheckElement(result->x[i]);
+	}
 
 	PG_RETURN_POINTER(result);
 }