diff --git a/src/Visitor.js b/src/Visitor.js
index 18c8858..993db22 100644
--- a/src/Visitor.js
+++ b/src/Visitor.js
@@ -467,7 +467,9 @@ export default class Visitor extends BasicVisitor {
 
   visitConditional(node: Conditional) {
     this.descend(node.condition);
-    this.descend(node.consequent);
+    if (node.consequent) {
+      this.descend(node.consequent);
+    }
     if (node.alternate) {
       this.descend(node.alternate);
     }
diff --git a/src/types.js b/src/types.js
index 99affe9..df715ea 100644
--- a/src/types.js
+++ b/src/types.js
@@ -153,7 +153,7 @@ export type CompoundAssignOp = {
 export type Conditional = {
   type: 'Conditional';
   condition: Expression;
-  consequent: Block;
+  consequent: ?Block;
   alternate: ?Block;
   isUnless: boolean;
   raw: string;
diff --git a/types.json b/types.json
index 3bc29ec..69c3285 100644
--- a/types.json
+++ b/types.json
@@ -190,7 +190,7 @@
       },
       {
         "name": "consequent",
-        "type": "Block"
+        "type": "?Block"
       },
       {
         "name": "alternate",