diff --git a/app/src/main/java/org/oppia/android/app/parser/StringToFractionParser.kt b/app/src/main/java/org/oppia/android/app/parser/StringToFractionParser.kt
index 62fc2e9a282..8a11120cacb 100644
--- a/app/src/main/java/org/oppia/android/app/parser/StringToFractionParser.kt
+++ b/app/src/main/java/org/oppia/android/app/parser/StringToFractionParser.kt
@@ -27,8 +27,12 @@ class StringToFractionParser {
    * detection should be done using [getRealTimeAnswerError], instead.
    */
   fun getSubmitTimeError(text: String): FractionParsingError {
-    if (invalidCharsLengthRegex.find(text) != null)
+    if (invalidCharsLengthRegex.find(text) != null) {
       return FractionParsingError.NUMBER_TOO_LONG
+    }
+    if (text.endsWith("/")) {
+      return FractionParsingError.INVALID_FORMAT
+    }
     val fraction = parseFraction(text)
     return when {
       fraction == null -> FractionParsingError.INVALID_FORMAT
diff --git a/app/src/test/java/org/oppia/android/app/parser/StringToFractionParserTest.kt b/app/src/test/java/org/oppia/android/app/parser/StringToFractionParserTest.kt
index 1d71c8c8afd..4e3f9141027 100644
--- a/app/src/test/java/org/oppia/android/app/parser/StringToFractionParserTest.kt
+++ b/app/src/test/java/org/oppia/android/app/parser/StringToFractionParserTest.kt
@@ -217,6 +217,22 @@ class StringToFractionParserTest {
     }
   }
 
+  @Test
+  fun testSubmitTimeError_noDenominator_returnsInvalidFormat() {
+    val error = stringToFractionParser.getSubmitTimeError("3/")
+    assertThat(error).isEqualTo(StringToFractionParser.FractionParsingError.INVALID_FORMAT)
+  }
+
+  @Test
+  fun testSubmitTimeError_noDenominator_invalidFormat_hasRelevantErrorMessage() {
+    activityRule.scenario.onActivity { activity ->
+      val errorMessage = stringToFractionParser.getSubmitTimeError("3/")
+        .getErrorMessageFromStringRes(activity.appLanguageResourceHandler)
+      assertThat(errorMessage)
+        .isEqualTo("Please enter a valid fraction (e.g., 5/3 or 1 2/3)")
+    }
+  }
+
   @Test
   fun testRealTimeError_regularFraction_returnsValid() {
     val error = stringToFractionParser.getRealTimeAnswerError("2/3")