diff --git a/CHANGELOG.md b/CHANGELOG.md
index d032e8cd952..f78bfd64901 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # vNext
 
+
 * Fix: Remove experimental annotation for Attachment #1257
 * Fix: Mark stacktrace as snapshot if captured at arbitrary moment #1231
 * Enchancement: Improve EventProcessor nullability annotations (#1229).
@@ -18,6 +19,7 @@
 * Enchancement: Add Request to the Scope. #1270
 * Fix: Fix SentryTransaction#getStatus NPE (#1273)
 * Enchancement: Optimize SentryTracingFilter when hub is disabled.
+* Fix: Discard unfinished Spans before sending them over to Sentry (#1279)
 * Fix: Interrupt the thread in QueuedThreadPoolExecutor (#1276)
 * Fix: SentryTransaction#finish should not clear another transaction from the scope (#1278)
 
diff --git a/sentry/src/main/java/io/sentry/SentryClient.java b/sentry/src/main/java/io/sentry/SentryClient.java
index 9979eae28f5..6464ba81530 100644
--- a/sentry/src/main/java/io/sentry/SentryClient.java
+++ b/sentry/src/main/java/io/sentry/SentryClient.java
@@ -409,6 +409,18 @@ public void captureSession(final @NotNull Session session, final @Nullable Objec
         }
       }
     }
+    final List<Span> unfinishedSpans = new ArrayList<>();
+    for (Span span : transaction.getSpans()) {
+      if (!span.isFinished()) {
+        unfinishedSpans.add(span);
+      }
+    }
+    if (!unfinishedSpans.isEmpty()) {
+      options
+          .getLogger()
+          .log(SentryLevel.WARNING, "Dropping %d unfinished spans", unfinishedSpans.size());
+    }
+    transaction.getSpans().removeAll(unfinishedSpans);
     return transaction;
   }
 
diff --git a/sentry/src/test/java/io/sentry/SentryClientTest.kt b/sentry/src/test/java/io/sentry/SentryClientTest.kt
index 71b78c4b70a..1fe7408304b 100644
--- a/sentry/src/test/java/io/sentry/SentryClientTest.kt
+++ b/sentry/src/test/java/io/sentry/SentryClientTest.kt
@@ -757,6 +757,25 @@ class SentryClientTest {
         }, eq(null))
     }
 
+    @Test
+    fun `when captureTransactions unfinished spans are removed`() {
+        val sut = fixture.getSut()
+        val transaction = SentryTransaction("a-transaction", "op")
+        val span1 = transaction.startChild("span1")
+        span1.finish()
+        val span2 = transaction.startChild("span2")
+
+        sut.captureTransaction(transaction, mock(), null)
+        verify(fixture.transport).send(check {
+            val sentTransaction = it.items.first().getTransaction(fixture.sentryOptions.serializer)
+                assertNotNull(sentTransaction) { tx ->
+                    val sentSpanIds = tx.spans.map { span -> span.spanId }
+                    assertTrue(sentSpanIds.contains(span1.spanContext.spanId))
+                    assertFalse(sentSpanIds.contains(span2.spanContext.spanId))
+                }
+        }, eq(null))
+    }
+
     @Test
     fun `when captureTransaction with attachments`() {
         val transaction = SentryTransaction("a-transaction", "op")