diff --git a/src/GanttElastic.vue b/src/GanttElastic.vue
index 195eb61..19a05c0 100644
--- a/src/GanttElastic.vue
+++ b/src/GanttElastic.vue
@@ -1590,12 +1590,13 @@ const GanttElastic = {
       let lastTaskTime = 0;
       for (let index = 0, len = this.state.tasks.length; index < len; index++) {
         let task = this.state.tasks[index];
-        const taskStart = Math.min(task.startTime, task.startPlanned);
+        const plannedStart = typeof task.startPlanned === 'number' ? task.startPlanned : task.startTimePlanned;
+        const taskStart = Math.min(task.startTime, plannedStart);
         if (taskStart < firstTaskTime) {
           firstTaskTime = taskStart;
         }
-
-        const taskLastTime = Math.max(task.startTime + task.duration, task.startPlanned + task.durationPlanned);
+        const plannedDuration = typeof task.durationPlanned === 'number' ? task.durationPlanned : 0;
+        const taskLastTime = Math.max(task.startTime + task.duration, plannedStart + plannedDuration);
         if (taskLastTime > lastTaskTime) {
           lastTaskTime = taskLastTime;
         }
diff --git a/src/components/Chart/DependencyLines.vue b/src/components/Chart/DependencyLines.vue
index bf4a036..e091886 100644
--- a/src/components/Chart/DependencyLines.vue
+++ b/src/components/Chart/DependencyLines.vue
@@ -138,7 +138,7 @@ export default {
       let points = `
         ${this.moveCursor(cursour, startX, startY)} 
         ${this.getLine(cursour, startMove, 0)}`;
-      if (dependencyType === dependencyTypes.startToStart) {
+      if (dependencyType === dependencyTypes.startToStart || dependencyType === dependencyTypes.startToEnd) {
         xMultiplier = -1
       } else if (dependencyType === dependencyTypes.endToEnd || dependencyType === dependencyTypes.endToStart) {
         xMultiplier = 1