diff --git a/web/app/src/components/JobsTable.vue b/web/app/src/components/JobsTable.vue
index 413145eb..ae1a6cd6 100644
--- a/web/app/src/components/JobsTable.vue
+++ b/web/app/src/components/JobsTable.vue
@@ -123,11 +123,17 @@ export default {
     processJobUpdate(jobUpdate) {
       // updateData() will only overwrite properties that are actually set on
       // jobUpdate, and leave the rest as-is.
-      this.tabulator.updateData([jobUpdate])
-        .then(this.sortData);
+      if (this.tabulator.initialized) {
+        this.tabulator.updateData([jobUpdate])
+          .then(this.sortData);
+      }
       this._refreshAvailableStatuses();
     },
     processNewJob(jobUpdate) {
+      if (this.tabulator.initialized) {
+        this.tabulator.updateData([jobUpdate])
+          .then(this.sortData);
+      }
       this.tabulator.addData([jobUpdate])
         .then(this.sortData);
       this._refreshAvailableStatuses();
diff --git a/web/app/src/components/TasksTable.vue b/web/app/src/components/TasksTable.vue
index e2edf6a5..b629dc03 100644
--- a/web/app/src/components/TasksTable.vue
+++ b/web/app/src/components/TasksTable.vue
@@ -128,8 +128,10 @@ export default {
     processTaskUpdate(taskUpdate) {
       // updateData() will only overwrite properties that are actually set on
       // taskUpdate, and leave the rest as-is.
-      this.tabulator.updateData([taskUpdate])
-        .then(this.sortData);
+      if (this.tabulator.initialized) {
+        this.tabulator.updateData([taskUpdate])
+          .then(this.sortData);
+      }
       this._refreshAvailableStatuses();
     },