diff --git a/src/SPARQLIngest.ts b/src/SPARQLIngest.ts
index ce4d76b..40989b1 100644
--- a/src/SPARQLIngest.ts
+++ b/src/SPARQLIngest.ts
@@ -3,7 +3,7 @@ import { SDS } from "@treecg/types";
 import { Store, Parser, DataFactory } from "n3";
 import { CREATE, UPDATE, DELETE } from "./SPARQLQueries";
 import { Quad_Subject, Term } from "@rdfjs/types";
-import { doSPARQLRequest } from "./Utils";
+import { doSPARQLRequest, sanitizeQuads } from "./Utils";
 
 const { quad, namedNode } = DataFactory;
 
@@ -123,6 +123,8 @@ export async function sparqlIngest(
                     const ctv = store.getQuads(null, config.changeSemantics!.changeTypePath, null, null)[0];
                     // Remove change type quad from store
                     store.removeQuad(ctv);
+                    // Sanitize quads to prevent issues on SPARQL queries
+                    sanitizeQuads(store);
                     // Assemble corresponding SPARQL UPDATE query
                     if (ctv.object.value === config.changeSemantics.createValue) {
                         query = CREATE(store, ng);
diff --git a/src/Utils.ts b/src/Utils.ts
index 24e15f0..63fe0fe 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -1,3 +1,16 @@
+import { XSD } from "@treecg/types";
+import { Store, DataFactory as DF } from "n3";
+
+export function sanitizeQuads(store: Store): void {
+    for (const q of store.getQuads(null, null, null, null)) {
+        if (q.object.termType === "Literal") {
+            if (/\+\d+/.test(q.object.value)) {
+                store.removeQuad(q);
+                store.addQuad(q.subject, q.predicate, DF.literal(q.object.value.substring(1), DF.namedNode(XSD.integer)), q.graph);
+            }
+        }
+    }
+}
 
 export async function doSPARQLRequest(query: string, url: string): Promise<void> {
     const res = await fetch(url, {
diff --git a/tests/SPARQLIngest.test.ts b/tests/SPARQLIngest.test.ts
index a322293..341ac08 100644
--- a/tests/SPARQLIngest.test.ts
+++ b/tests/SPARQLIngest.test.ts
@@ -537,7 +537,8 @@ function dataGenerator(
                         a ex:NestedEntity;
                         ex:nestedProp "some other value"
                     ];
-                    ex:prop3 ex:SomeNamedNode.
+                    ex:prop3 ex:SomeNamedNode;
+                    ex:propNum +30.
                 ` : "."}
         `;
     } else {