diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/function/array/ArrayAndElementArgumentValidator.java b/hibernate-core/src/main/java/org/hibernate/dialect/function/array/ArrayAndElementArgumentValidator.java
index 398bdf5feb19..223e57e14442 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/function/array/ArrayAndElementArgumentValidator.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/function/array/ArrayAndElementArgumentValidator.java
@@ -38,7 +38,8 @@ public void validate(
 		for ( int elementIndex : elementIndexes ) {
 			if ( elementIndex < arguments.size() ) {
 				final SqmTypedNode<?> elementArgument = arguments.get( elementIndex );
-				final SqmExpressible<?> elementType = elementArgument.getExpressible().getSqmType();
+				final SqmExpressible<?> expressible = elementArgument.getExpressible();
+				final SqmExpressible<?> elementType = expressible != null ? expressible.getSqmType() : null;
 				if ( expectedElementType != null && elementType != null && expectedElementType != elementType ) {
 					throw new FunctionArgumentException(
 							String.format(
diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionFunction.java b/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionFunction.java
index e936a19ac0df..1034a95c2f17 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionFunction.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionFunction.java
@@ -9,6 +9,7 @@
 import java.util.List;
 
 import org.hibernate.query.ReturnableType;
+import org.hibernate.sql.ast.SqlAstNodeRenderingMode;
 import org.hibernate.sql.ast.SqlAstTranslator;
 import org.hibernate.sql.ast.spi.SqlAppender;
 import org.hibernate.sql.ast.tree.SqlAstNode;
@@ -37,7 +38,7 @@ public void render(
 		sqlAppender.append( " is not null then coalesce((select t.idx from unnest(");
 		arrayExpression.accept( walker );
 		sqlAppender.append(") with ordinality t(val,idx) where t.val is not distinct from " );
-		elementExpression.accept( walker );
+		walker.render( elementExpression, SqlAstNodeRenderingMode.NO_PLAIN_PARAMETER );
 		if ( sqlAstArguments.size() > 2 ) {
 			sqlAppender.append( " and t.idx>=" );
 			sqlAstArguments.get( 2 ).accept( walker );
diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionsFunction.java b/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionsFunction.java
index 85149b6378d4..35acf858b927 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionsFunction.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayPositionsFunction.java
@@ -9,6 +9,7 @@
 import java.util.List;
 
 import org.hibernate.query.ReturnableType;
+import org.hibernate.sql.ast.SqlAstNodeRenderingMode;
 import org.hibernate.sql.ast.SqlAstTranslator;
 import org.hibernate.sql.ast.spi.SqlAppender;
 import org.hibernate.sql.ast.tree.SqlAstNode;
@@ -37,7 +38,7 @@ public void render(
 		sqlAppender.append( " is not null then coalesce((select array_agg(t.idx) from unnest(");
 		arrayExpression.accept( walker );
 		sqlAppender.append(") with ordinality t(val,idx) where t.val is not distinct from " );
-		elementExpression.accept( walker );
+		walker.render( elementExpression, SqlAstNodeRenderingMode.NO_PLAIN_PARAMETER );
 		sqlAppender.append( "),cast(array[] as integer array)) end" );
 	}
 }
diff --git a/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionTest.java b/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionTest.java
index 65bac8406609..7746d94634a5 100644
--- a/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionTest.java
+++ b/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionTest.java
@@ -87,6 +87,18 @@ public void testPositionNull(SessionFactoryScope scope) {
 		} );
 	}
 
+	@Test
+	@Jira("https://hibernate.atlassian.net/browse/HHH-19490")
+	public void testPositionParam(SessionFactoryScope scope) {
+		scope.inSession( em -> {
+			List<EntityWithArrays> results = em.createQuery( "from EntityWithArrays e where array_position(e.theArray, ?1) = 1", EntityWithArrays.class )
+					.setParameter( 1, "abc" )
+					.getResultList();
+			assertEquals( 1, results.size() );
+			assertEquals( 2L, results.get( 0 ).getId() );
+		} );
+	}
+
 	@Test
 	@Jira("https://hibernate.atlassian.net/browse/HHH-17801")
 	public void testEnumPosition(SessionFactoryScope scope) {
diff --git a/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionsTest.java b/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionsTest.java
index 3e387cf23b04..042cc29e47f3 100644
--- a/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionsTest.java
+++ b/hibernate-core/src/test/java/org/hibernate/orm/test/function/array/ArrayPositionsTest.java
@@ -17,6 +17,7 @@
 import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
 import org.hibernate.testing.orm.junit.DialectFeatureChecks;
 import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.Jira;
 import org.hibernate.testing.orm.junit.RequiresDialectFeature;
 import org.hibernate.testing.orm.junit.SessionFactory;
 import org.hibernate.testing.orm.junit.SessionFactoryScope;
@@ -94,6 +95,20 @@ public void testPositionsNull(SessionFactoryScope scope) {
 		} );
 	}
 
+	@Test
+	@Jira("https://hibernate.atlassian.net/browse/HHH-19490")
+	public void testPositionsParam(SessionFactoryScope scope) {
+		scope.inSession( em -> {
+			List<int[]> results = em.createQuery( "select array_positions(e.theArray, ?1) from EntityWithArrays e order by e.id", int[].class )
+					.setParameter( 1, "abc" )
+					.getResultList();
+			assertEquals( 3, results.size() );
+			assertArrayEquals( new int[0], results.get( 0 ) );
+			assertArrayEquals( new int[]{ 1, 4 }, results.get( 1 ) );
+			assertNull( results.get( 2 ) );
+		} );
+	}
+
 	@Test
 	public void testPositionsList(SessionFactoryScope scope) {
 		scope.inSession( em -> {