diff --git a/src/main/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtils.kt b/src/main/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtils.kt
index 7b310a4f7..502cc181f 100644
--- a/src/main/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtils.kt
+++ b/src/main/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtils.kt
@@ -68,9 +68,12 @@ const val DATE_FIELD_EPOCH_MILLIS_FORMAT = "epoch_millis"
 
 @Suppress("ReturnCount")
 fun isRollupIndex(index: String, clusterState: ClusterState): Boolean {
-    if (RollupSettings.ROLLUP_INDEX.get(clusterState.metadata.index(index).settings)) {
+    val idx = clusterState.metadata.index(index)
+    if (idx == null) {
+        return false
+    } else if (RollupSettings.ROLLUP_INDEX.get(idx.settings)) {
         return true
-    } else if (LegacyOpenDistroRollupSettings.ROLLUP_INDEX.get(clusterState.metadata.index(index).settings)) {
+    } else if (LegacyOpenDistroRollupSettings.ROLLUP_INDEX.get(idx.settings)) {
         return true
     }
     return false
diff --git a/src/test/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtilsTests.kt b/src/test/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtilsTests.kt
index c063a3487..d535f1fb7 100644
--- a/src/test/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtilsTests.kt
+++ b/src/test/kotlin/org/opensearch/indexmanagement/rollup/util/RollupUtilsTests.kt
@@ -5,6 +5,11 @@
 
 package org.opensearch.indexmanagement.rollup.util
 
+import com.nhaarman.mockitokotlin2.doReturn
+import com.nhaarman.mockitokotlin2.mock
+import com.nhaarman.mockitokotlin2.whenever
+import org.opensearch.cluster.ClusterState
+import org.opensearch.cluster.metadata.Metadata
 import org.opensearch.index.query.BoolQueryBuilder
 import org.opensearch.index.query.ConstantScoreQueryBuilder
 import org.opensearch.index.query.DisMaxQueryBuilder
@@ -230,4 +235,16 @@ class RollupUtilsTests : OpenSearchTestCase() {
             assertEquals("Rewritten aggregation builder is not the correct type", aggBuilder.type, rewrittenAgg.type)
         }
     }
+
+    fun `test isRollupIndex`() {
+        val indexName = "missing index"
+        val clusterState: ClusterState = mock()
+        val metadata: Metadata = mock()
+
+        whenever(clusterState.metadata).doReturn(metadata)
+        whenever(metadata.index(indexName)).doReturn(null)
+
+        val actual = isRollupIndex(indexName, clusterState)
+        assertFalse(actual)
+    }
 }