diff --git a/core/src/main/kotlin/org/evomaster/core/problem/api/service/ApiWsStructureMutator.kt b/core/src/main/kotlin/org/evomaster/core/problem/api/service/ApiWsStructureMutator.kt
index e2085301bf..fefc12a420 100644
--- a/core/src/main/kotlin/org/evomaster/core/problem/api/service/ApiWsStructureMutator.kt
+++ b/core/src/main/kotlin/org/evomaster/core/problem/api/service/ApiWsStructureMutator.kt
@@ -277,6 +277,7 @@ abstract class ApiWsStructureMutator : StructureMutator() {
         val oldSqlActions = mutableListOf<EnvironmentAction>().plus(ind.seeInitializingActions())
 
         val failedWhereQueries = evaluatedIndividual.fitness.getViewOfAggregatedFailedWhereQueries()
+            .filter { it.isNotBlank() }
         val addedSqlInsertions = handleFailedWhereSQL(ind, fw, failedWhereQueries, mutatedGenes, sampler)
 
         ind.repairInitializationActions(randomness)
diff --git a/core/src/test/kotlin/org/evomaster/core/search/FitnessValueTest.kt b/core/src/test/kotlin/org/evomaster/core/search/FitnessValueTest.kt
index b7ce647f0f..d518524071 100644
--- a/core/src/test/kotlin/org/evomaster/core/search/FitnessValueTest.kt
+++ b/core/src/test/kotlin/org/evomaster/core/search/FitnessValueTest.kt
@@ -5,6 +5,8 @@ import org.evomaster.client.java.controller.api.dto.BootTimeInfoDto
 import org.evomaster.client.java.controller.api.dto.TargetInfoDto
 import org.evomaster.client.java.instrumentation.shared.ObjectiveNaming
 import org.evomaster.core.search.service.IdMapper
+import org.evomaster.core.sql.DatabaseExecution
+import org.evomaster.core.sql.SqlExecutionInfo
 import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 
@@ -123,4 +125,37 @@ class FitnessValueTest {
         assertEquals(3, linesInfo.searchTime)
     }
 
+    @Test
+    fun testAggregatedFailedWhereQueriesExcludesBlankEntries() {
+        val fv = FitnessValue(1.0)
+
+        val execution = DatabaseExecution(
+            queriedData = emptyMap(),
+            updatedData = emptyMap(),
+            insertedData = emptyMap(),
+            failedWhere = emptyMap(),
+            deletedData = emptyList(),
+            numberOfSqlCommands = 3,
+            sqlParseFailureCount = 0,
+            executionInfo = listOf(
+                SqlExecutionInfo("SELECT * FROM foo WHERE id = 1", false, 10L),
+                SqlExecutionInfo("", false, 5L),
+                SqlExecutionInfo("   ", false, 5L),
+                SqlExecutionInfo("SELECT * FROM bar WHERE name = 'x'", false, 8L)
+            )
+        )
+        fv.setDatabaseExecution(0, execution)
+        fv.aggregateDatabaseData()
+
+        val allQueries = fv.getViewOfAggregatedFailedWhereQueries()
+        assertEquals(4, allQueries.size)
+
+        // Simulate the filter applied in ApiWsStructureMutator before sending queries to the solver
+        val nonBlankQueries = allQueries.filter { it.isNotBlank() }
+        assertEquals(2, nonBlankQueries.size)
+        assertTrue(nonBlankQueries.none { it.isBlank() })
+        assertTrue(nonBlankQueries.contains("SELECT * FROM foo WHERE id = 1"))
+        assertTrue(nonBlankQueries.contains("SELECT * FROM bar WHERE name = 'x'"))
+    }
+
 }
\ No newline at end of file