diff --git a/packages/parser/antlr4/lib/src/main/antlr/FoodDescription.g4 b/packages/parser/antlr4/lib/src/main/antlr/FoodDescription.g4
index c14543e8..83b9faa5 100644
--- a/packages/parser/antlr4/lib/src/main/antlr/FoodDescription.g4
+++ b/packages/parser/antlr4/lib/src/main/antlr/FoodDescription.g4
@@ -16,7 +16,7 @@ quantity
   ;
 
 unit
-  : WORD+ | WORD* LEFT_PAREN (WHOLE_NUMBER | FRACTION | WORD | SLASH | PERIOD)+ RIGHT_PAREN
+  : WORD+ | WORD* LEFT_PAREN (WHOLE_NUMBER | FRACTION | WORD | SLASH | PERIOD)* RIGHT_PAREN?
   ;
 
 WORD
diff --git a/src/features/suggestions/generate/autoSuggestion.test.ts b/src/features/suggestions/generate/autoSuggestion.test.ts
index ab2d93a6..8ee8088b 100644
--- a/src/features/suggestions/generate/autoSuggestion.test.ts
+++ b/src/features/suggestions/generate/autoSuggestion.test.ts
@@ -259,3 +259,59 @@ test("unknown unit from input, choose the measurement whose unit is also unknown
     }
   });
 })
+
+test("unit with parenthesis should generate serving suggestion", () => {
+  const autoCompletion = {
+    foodName: "Doughnut",
+    amount: "1 (3 1/4 inch dia.)"
+  }
+  const suggestions = [
+    {
+      foodName: "Doughnut, cake (plain)",
+      amount: "1 (3 1/4 inch dia.)",
+      serving: {
+        carbohydrate: 0.5,
+        fat: 3,
+        sweet: 0.5,
+      }
+    }
+  ]
+  const result = generateAutoSuggestion(autoCompletion, suggestions);
+  expect(result).toEqual({
+    foodName: "Doughnut",
+    amount: "1 (3 1/4 inch dia.)",
+    serving: {
+      carbohydrate: 0.5,
+      fat: 3,
+      sweet: 0.5,
+  }
+  });
+})
+
+test("unit with open parenthesis should not generate serving suggestion", () => {
+  const autoCompletion = {
+    foodName: "Doughnut",
+    amount: "1 ("
+  }
+  const suggestions = [
+    {
+      foodName: "Doughnut, cake (plain)",
+      amount: "1 (3 1/4 inch dia.)",
+      serving: {
+        carbohydrate: 0.5,
+        fat: 3,
+        sweet: 0.5,
+      }
+    }
+  ]
+  const result = generateAutoSuggestion(autoCompletion, suggestions);
+  expect(result).toEqual({
+    foodName: "Doughnut",
+    amount: "1 (3 1/4 inch dia.)",
+    serving: {
+      carbohydrate: 0.5,
+      fat: 3,
+      sweet: 0.5,
+  }
+  });
+})
diff --git a/src/features/suggestions/generate/autoSuggestion.ts b/src/features/suggestions/generate/autoSuggestion.ts
index c6d85082..632077d7 100644
--- a/src/features/suggestions/generate/autoSuggestion.ts
+++ b/src/features/suggestions/generate/autoSuggestion.ts
@@ -2,6 +2,7 @@ import _ from 'lodash';
 import { Suggestion } from "../Suggestion";
 import baseOn from './calculateServing';
 import { PredefinedSuggestion } from "../search/PredefinedSuggestion";
+import { isAmountParsable } from './isAmountParsable';
 
 export function generateAutoSuggestion(autoCompletion: Suggestion, suggestions: PredefinedSuggestion[]) {
   if (_.size(suggestions) === 0) return null;
@@ -16,7 +17,7 @@ function createAutoSuggestion(nameSuggestion: Suggestion, suggestion: Predefined
     ...suggestion,
     foodName
   };
-  if (amount) {
+  if (amount && isAmountParsable(amount)) {
     const serving = baseOn(suggestion).servingFor(amount);
     return {
       ...autoSuggestion,
diff --git a/src/features/suggestions/generate/generateSuggestion.ts b/src/features/suggestions/generate/generateSuggestion.ts
index e946a98d..d7db2d93 100644
--- a/src/features/suggestions/generate/generateSuggestion.ts
+++ b/src/features/suggestions/generate/generateSuggestion.ts
@@ -5,16 +5,18 @@ import findAutoCompletions from '../search/autoCompletion';
 import { findSuggestions } from '../search/foodNameSearch';
 import { Suggestion } from '../Suggestion';
 import { generateAutoSuggestion } from './autoSuggestion';
+import { isAmountParsable } from './isAmountParsable';
 
 function unitOfMeasurement(amount?: string) {
-  if (_.isUndefined(amount)) return undefined;
-
-  const { measurement } = parseAmount(amount);
-  return measurement.unit;
+  if (amount && isAmountParsable(amount)) {
+    const { measurement } = parseAmount(amount);
+    return measurement.unit;
+  }
+  return undefined;
 }
 
 export function generateSuggestions(
-  foodDescriptionRef: React.MutableRefObject<string>,
+  foodDescriptionRef: React.RefObject<string>,
   callback: (suggestions: Suggestion[]) => void
 ) {
   const foodDescription = decompose(foodDescriptionRef.current + "");
@@ -22,7 +24,8 @@ export function generateSuggestions(
 
   const firstAutoCompletion = autoCompletions[0];
   const servingSuggestions = findSuggestions(foodDescription.foodName, { convertibleFrom: unitOfMeasurement(firstAutoCompletion.amount) });
-  const allSuggestions = _.concat(autoCompletions, generateAutoSuggestion(firstAutoCompletion, servingSuggestions), servingSuggestions);
+  const autoSuggestions = generateAutoSuggestion(firstAutoCompletion, servingSuggestions);
+  const allSuggestions = _.concat(autoCompletions, autoSuggestions, servingSuggestions);
   const results = _.uniqWith(_.compact(allSuggestions), _.isEqual)
     .slice(0, 5);
   return callback(results);
diff --git a/src/features/suggestions/generate/isAmountParsable.ts b/src/features/suggestions/generate/isAmountParsable.ts
new file mode 100644
index 00000000..8f64ef7d
--- /dev/null
+++ b/src/features/suggestions/generate/isAmountParsable.ts
@@ -0,0 +1,14 @@
+import _ from 'lodash';
+
+/**
+ * Amount string is parsable if it has matching parentheses. Default to true if there is no parentheses.
+ *
+ * @param amount Amount string to check if it is parsable
+ * @returns true if amount is parsable, false otherwise
+ */
+export function isAmountParsable(amount: string) {
+  if (_.endsWith(amount, ")")) {
+    return amount.includes("(");
+  }
+  return !amount.includes("(");
+}
diff --git a/src/features/suggestions/parser/foodDescription.test.js b/src/features/suggestions/parser/foodDescription.test.js
index 3e56e5d0..756b02a1 100644
--- a/src/features/suggestions/parser/foodDescription.test.js
+++ b/src/features/suggestions/parser/foodDescription.test.js
@@ -247,4 +247,16 @@ test("parenthesis in unit includes /", () => {
       }
     }
   );
+})
+
+test("parenthesis in unit with no content", () => {
+  expect(parseFoodDescription("Muffin 1 large (")).toMatchObject(
+    {
+      foodName: "Muffin",
+      amount: "1 large (",
+      measurement: {
+        unitText: "large (",
+      }
+    }
+  );
 })
\ No newline at end of file
diff --git a/src/features/suggestions/search/autoCompletion.ts b/src/features/suggestions/search/autoCompletion.ts
index f3c3d1b1..3d53063a 100644
--- a/src/features/suggestions/search/autoCompletion.ts
+++ b/src/features/suggestions/search/autoCompletion.ts
@@ -4,16 +4,20 @@ import { createSuggestion, Suggestion } from '../Suggestion';
 import autoCompleteUnit from './unitMiniSearch';
 import { DecomposedFoodDescription } from '../parser/DecomposedFoodDescription';
 import { findNameSuggestions } from './foodNameSearch';
+import { isAmountParsable } from '../generate/isAmountParsable';
 
 export default function findAutoCompletions(foodDescription: DecomposedFoodDescription): Suggestion[] {
   const { foodName, amount, foodNameCompleted, unitCompleted } = foodDescription;
   if (foodNameCompleted) {
     if (amount && !unitCompleted) {
       const suggestionWithAmount = _.partial(createSuggestion, foodName);
-      const amountAutoCompletions = findAmountAutoCompletions(parseAmount(amount))
-        .map(suggestionWithAmount);
-      if (_.size(amountAutoCompletions) > 0)
-        return amountAutoCompletions;
+      if (isAmountParsable(amount)) {
+        const amountAutoCompletions = findAmountAutoCompletions(parseAmount(amount))
+          .map(suggestionWithAmount);
+        if (_.size(amountAutoCompletions) > 0) {
+          return amountAutoCompletions;
+        }
+      }
     }
     return [createSuggestion(foodName, amount)];
   }