diff --git a/libs/pbd/pbd/integer_division.h b/libs/pbd/pbd/integer_division.h
index 323fbf03c8..1eee8c58b3 100644
--- a/libs/pbd/pbd/integer_division.h
+++ b/libs/pbd/pbd/integer_division.h
@@ -32,6 +32,10 @@
 template<typename T>
 T int_div_round (T x, T y)
 {
+	if (y == 0) {
+		/* usually `y' is sample-rate, or beats/bar */
+		return (x == 0) ? 0 : 1;
+	}
 	/* essentially ((x + (y/2)) / y) but handles signed/negative values correcvtly */
 	return (x + PBD_IDIV_ROUNDING(x,y)) / y ;
 }
diff --git a/libs/temporal/temporal/superclock.h b/libs/temporal/temporal/superclock.h
index 4eb2c02bf3..7891d0096b 100644
--- a/libs/temporal/temporal/superclock.h
+++ b/libs/temporal/temporal/superclock.h
@@ -35,7 +35,7 @@ typedef int64_t superclock_t;
 	static superclock_t superclock_ticks_per_second = 508032000; // 2^10 * 3^4 * 5^3 * 7^2
 #endif
 
-static inline superclock_t superclock_to_samples (superclock_t s, int sr) { return int_div_round (s * sr, superclock_ticks_per_second); }
+static inline superclock_t superclock_to_samples (superclock_t s, int sr) { return sr == 0 ? 0 : int_div_round (s * sr, superclock_ticks_per_second); }
 static inline superclock_t samples_to_superclock (int64_t samples, int sr) { return int_div_round (samples * superclock_ticks_per_second, superclock_t (sr)); }
 
 extern int (*sample_rate_callback)();