diff --git a/jOOQ-test/src/org/jooq/test/_/testcases/InsertUpdateTests.java b/jOOQ-test/src/org/jooq/test/_/testcases/InsertUpdateTests.java
index 236a86b433..990adb44ed 100644
--- a/jOOQ-test/src/org/jooq/test/_/testcases/InsertUpdateTests.java
+++ b/jOOQ-test/src/org/jooq/test/_/testcases/InsertUpdateTests.java
@@ -52,6 +52,7 @@ import static org.jooq.SQLDialect.SYBASE;
 import static org.jooq.impl.Factory.cast;
 import static org.jooq.impl.Factory.castNull;
 import static org.jooq.impl.Factory.count;
+import static org.jooq.impl.Factory.inline;
 import static org.jooq.impl.Factory.max;
 import static org.jooq.impl.Factory.val;
 import static org.jooq.impl.Factory.vals;
@@ -345,6 +346,18 @@ extends BaseTest<A, B, S, B2S, BS, L, X, DATE, BOOL, D, T, U, I, IPK, T658, T725
         assertEquals(37, (int) author2.getValue(TAuthor_ID()));
         assertEquals("Erich", author2.getValue(TAuthor_FIRST_NAME()));
         assertEquals("Kästner", author2.getValue(TAuthor_LAST_NAME()));
+
+        // [#1343] Conversion mustn't be done on jOOQ artefacts
+        assertEquals(1,
+        create().insertInto(TAuthor())
+                .values(
+                    create().select(vals(38)),
+                    val("Alfred"),
+                    inline("Hitchcock"),
+                    val(null),
+                    inline((Object) null),
+                    create().select(val(null)).asField())
+                .execute());
     }
 
     @Test
diff --git a/jOOQ/src/main/java/org/jooq/impl/InsertImpl.java b/jOOQ/src/main/java/org/jooq/impl/InsertImpl.java
index b59deffe50..6fa69261c2 100644
--- a/jOOQ/src/main/java/org/jooq/impl/InsertImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/InsertImpl.java
@@ -44,6 +44,7 @@ import java.util.Map;
 import org.jooq.AttachableInternal;
 import org.jooq.Configuration;
 import org.jooq.Field;
+import org.jooq.FieldLike;
 import org.jooq.Insert;
 import org.jooq.InsertOnDuplicateSetMoreStep;
 import org.jooq.InsertQuery;
@@ -133,8 +134,19 @@ class InsertImpl<R extends Record>
         return values(values.toArray());
     }
 
+    @SuppressWarnings("unchecked")
     private <T> void addValue(InsertQuery<R> delegate, Field<T> field, Object object) {
-        delegate.addValue(field, field.getDataType().convert(object));
+
+        // [#1343] Only convert non-jOOQ objects
+        if (object instanceof Field) {
+            delegate.addValue(field, (Field<T>) object);
+        }
+        else if (object instanceof FieldLike) {
+            delegate.addValue(field, ((FieldLike) object).<T>asField());
+        }
+        else {
+            delegate.addValue(field, field.getDataType().convert(object));
+        }
     }
 
     @SuppressWarnings("unchecked")