diff --git a/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/ColumnType.kt b/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/ColumnType.kt
index f3c35ac1f4..a51959efec 100644
--- a/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/ColumnType.kt
+++ b/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/ColumnType.kt
@@ -69,7 +69,7 @@ interface IColumnType {
     }
 
     /**
-     * Function checks that provided value suites the column type and throws [IllegalArgumentException] otherwise.
+     * Function checks that provided value is suites the column type and throws [IllegalArgumentException] otherwise.
      * [value] can be of any type (including [Expression])
      * */
     @Throws(IllegalArgumentException::class)
diff --git a/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/statements/UpdateBuilder.kt b/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/statements/UpdateBuilder.kt
index 5577b01274..cb6cef45f9 100644
--- a/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/statements/UpdateBuilder.kt
+++ b/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/statements/UpdateBuilder.kt
@@ -14,7 +14,6 @@ abstract class UpdateBuilder<out T>(type: StatementType, targets: List<Table>) :
 
     open operator fun <S> set(column: Column<S>, value: S) {
         when {
-            values.containsKey(column) -> error("$column is already initialized")
             !column.columnType.nullable && value == null -> error("Trying to set null to not nullable column $column")
             else -> {
                 column.columnType.validateValueBeforeUpdate(value)