Content must not be null error when uploading global logo

java.lang.IllegalArgumentException: Content must not be null
at org.springframework.util.Assert.notNull(Assert.java:112)
at com.atlassian.confluence.pages.attachments.CachingAttachmentDao.getLatestAttachment(CachingAttachmentDao.java:59)
at com.atlassian.confluence.pages.DefaultAttachmentManager.getAttachment(DefaultAttachmentManager.java:41)
at com.atlassian.confluence.pages.DelegatorAttachmentManager.getAttachment(DelegatorAttachmentManager.java:68)
at sun.reflect.GeneratedMethodAccessor388.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy18.getAttachment(Unknown Source)