diff --git a/index.js b/index.js
index b050e698..941f7e19 100644
--- a/index.js
+++ b/index.js
@@ -90,8 +90,6 @@ var Sharp = function(input, options) {
     gamma: 0,
     greyscale: false,
     normalize: 0,
-    bandBoolOp: null,
-    booleanOp: null,
     booleanBufferIn: null,
     booleanFileIn: '',
     // overlay
diff --git a/src/pipeline.cc b/src/pipeline.cc
index 20f2a645..78223750 100644
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -1289,10 +1289,14 @@ NAN_METHOD(pipeline) {
     }
   }
   // Bandbool operation
-  baton->bandBoolOp = GetBooleanOperation(attrAsStr(options, "bandBoolOp"));
+  if(Has(options, New("bandBoolOp").ToLocalChecked()).FromJust()) {
+    baton->bandBoolOp = GetBooleanOperation(attrAsStr(options, "bandBoolOp"));
+  }
 
   // Boolean operation
-  baton->booleanOp = GetBooleanOperation(attrAsStr(options, "booleanOp"));
+  if(Has(options, New("booleanOp").ToLocalChecked()).FromJust()) {
+    baton->booleanOp = GetBooleanOperation(attrAsStr(options, "booleanOp"));
+  }
 
   // Function to notify of queue length changes
   Callback *queueListener = new Callback(
diff --git a/test/unit/extract.js b/test/unit/extract.js
index 059e3e57..655eab52 100644
--- a/test/unit/extract.js
+++ b/test/unit/extract.js
@@ -181,6 +181,7 @@ describe('Partial image extraction', function() {
         .extract({ left: 3000, top: 10, width: 10, height: 10 })
         .toBuffer(function(err) {
           assert(err instanceof Error);
+          assert.strictEqual(err.message, "extract_area: bad extract area\n");
           done();
         });
     });