diff --git a/htdocs/supplier_proposal/class/supplier_proposal.class.php b/htdocs/supplier_proposal/class/supplier_proposal.class.php
index e1a0a71f840ce..0aba526fa84c7 100644
--- a/htdocs/supplier_proposal/class/supplier_proposal.class.php
+++ b/htdocs/supplier_proposal/class/supplier_proposal.class.php
@@ -1310,7 +1310,7 @@ public function fetch($rowid, $ref = '')
 				$this->cond_reglement       = $obj->cond_reglement;
 				$this->cond_reglement_doc   = $obj->cond_reglement_libelle_doc;
 
-				$this->extraparams = (array) json_decode($obj->extraparams, true);
+				$this->extraparams = (array) (!empty($obj->extraparams) ? json_decode($obj->extraparams, true) : array());
 
 				$this->user_author_id = $obj->fk_user_author;
 				$this->user_validation_id = $obj->fk_user_valid;