diff --git a/src/kiri/main.js b/src/kiri/main.js
index d9a68ca6..52737b62 100644
--- a/src/kiri/main.js
+++ b/src/kiri/main.js
@@ -735,7 +735,7 @@
 
     function getOverlappingRanges(lo, hi) {
         let ranges = [];
-        for (let range of settings.process.ranges) {
+        for (let range of settings.process.ranges || []) {
             let in_lo = range.lo >= lo && range.lo <= hi;
             let in_hi = range.hi >= lo && range.hi <= hi;
             if (in_lo || in_hi) {
diff --git a/src/kiri/slicer.js b/src/kiri/slicer.js
index 6320cf5c..a21ecff3 100644
--- a/src/kiri/slicer.js
+++ b/src/kiri/slicer.js
@@ -715,8 +715,8 @@
 
         // create point map, unique point list and point group arrays
         input.forEach(function(line) {
-            p1 = cachedPoint(line.p1);
-            p2 = cachedPoint(line.p2);
+            p1 = cachedPoint(line.p1.round(4));
+            p2 = cachedPoint(line.p2.round(4));
             addConnected(p1,p2);
             addConnected(p2,p1);
         });