diff --git a/package.json b/package.json
index f95d3d5..a6e6e0e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@watergis/geojson2inp",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "This module converts GeoJSON to EPANET INP file",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/inp/InpCurves.ts b/src/inp/InpCurves.ts
index 3a783d1..62f33bc 100644
--- a/src/inp/InpCurves.ts
+++ b/src/inp/InpCurves.ts
@@ -20,8 +20,8 @@ export default class InpPumps extends InpBase {
     if (!data)return;
     const contents = [
       pad(data.id, 16),
-      pad(data.flow.toString(), 12),
-      pad(data.head.toString(), 12)
+      pad(data.flow?data.flow.toString():'', 12),
+      pad(data.head?data.head.toString():'', 12)
     ];
     this.addText(` ${contents.join('\t')}\t;\n`);
   }